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https://java.sevendays-study.com/
※量が多いのでまずは基本編の問題の0日目~7日目まで
基本問題(1):最も基本的なプログラム、演算と変数
prob1-1.(難易度:★)
public static void main(String[] args) {
System.out.println("田中 太郎");
}
prob1-2.(難易度:★)
public static void main(String[] args) {
System.out.println("ABCDEF\nGHI");
}
prob1-3.(難易度:★)
public static void main(String[] args) {
System.out.println(1 + " + " + 1 + " = " + (1 + 1));
System.out.println(2 + " + " + 3 + " = " + (2 + 3));
}
prob1-4(難易度:★)
public static void main(String[] args) {
int num1 = 1;
int num2 = 2;
int num3 = 3;
int sum = num1 + num2 + num3;
System.out.println(num1 + " + " + num2 + " + " + num3 + " = " + sum);
}
prob2-1.(難易度:★)
public static void main(String[] args) {
int a = 5, b = 3;
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("a + b = " + (a + b));
System.out.println("a - b = " + (a - b));
System.out.println("a * b = " + (a * b));
System.out.println("a / b = " + (a / b));
System.out.println("a % b = " + (a % b));
}
prob2-2.(難易度:★★)
public static void main(String[] args) {
int a = 1, b = 2, c = 3, d = 4, e = 5;
a += 2;
b -= 1;
c *= 3;
d /= 2;
e %= 2;
System.out.println("a = " + a);
System.out.println("b = " + b);
System.out.println("c = " + c);
System.out.println("d = " + d);
System.out.println("e = " + e);
}
基本問題(2):条件分岐
prob3-1.(難易度:★)
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1;
System.out.println("乱数: " + randomNumber);
if (randomNumber >= 5) {
System.out.println("5以上です");
}
}
prob3-2.(難易度:★)
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1;
System.out.println("乱数: " + randomNumber);
if (randomNumber != 1) {
System.out.println("1ではありません");
}
}
prob3-3.(難易度:★)
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(100) + 1;
System.out.println("乱数: " + randomNumber);
if (randomNumber < 50) {
System.out.println("50未満です");
}
}
prob3-4.(難易度:★)
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(100) + 1;
System.out.println("乱数: " + randomNumber);
if (randomNumber <= 10 || randomNumber >= 90) {
System.out.println("10以下か90以上の値です");
}
}
prob3-5.(難易度:★)
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(100) + 1;
System.out.println("乱数: " + randomNumber);
if (randomNumber >= 20 && randomNumber < 80) {
System.out.println("20以上80未満です");
}
}
prob3-6.(難易度:★)
public static void main(String[] args) {
int num = (int) (Math.random() * 6) + 1;
System.out.println("数値 : " + num);
if (num >= 3) {
System.out.println("3以上です");
}
}
prob3-7.(難易度:★)
import java.util.Random;
public class Problem3_7 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(10) + 1;
System.out.println(num);
if (num >= 5) {
System.out.println("5以上です");
} else {
System.out.println("5未満です");
}
}
}
prob3-8.(難易度:★)
import java.util.Random;
public class Problem3_8 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(10) + 1;
System.out.println(num);
if (num != 1) {
System.out.println("1ではありません");
} else {
System.out.println("1です");
}
}
}
prob3-9.(難易度:★)
import java.util.Random;
public class Problem3_9 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(100) + 1;
System.out.println(num);
if (num < 50) {
System.out.println("50未満です");
} else {
System.out.println("50以上です");
}
}
}
prob3-10.(難易度:★)
import java.util.Random;
public class Problem3_10 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println("数値: " + num);
if (num <= 10 || num >= 90) {
System.out.println("10以下か90以上の値です");
} else {
System.out.println("10より大きく90未満です");
}
}
}
prob3-11.(難易度:★)
import java.util.Random;
public class Problem3_11 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println("数値: " + num);
if (num >= 20 && num < 80) {
System.out.println("20以上80未満です");
} else {
System.out.println("20未満か、80以上です");
}
}
}
prob3-12.(難易度:★)
import java.util.Random;
public class Problem3_12 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(21) - 10; // -10から10までの乱数を生成
System.out.println("数値: " + num);
if (num < 0) {
System.out.println("負の値です");
} else if (num > 0) {
System.out.println("正の値です");
} else {
System.out.println("0です");
}
}
}
prob3-13.(難易度:★)
import java.util.Random;
public class Problem3_13 {
public static void main(String[] args) {
Random random = new Random();
int num = random.nextInt(3) + 1; // 1から3までの乱数を生成
System.out.print("数値: " + num + " - ");
if (num == 1) {
System.out.println("グー");
} else if (num == 2) {
System.out.println("パー");
} else {
System.out.println("チョキ");
}
}
}
prob3-15.(難易度:★★)
import java.util.Random;
public class Problem3_15 {
public static void main(String[] args) {
Random random = new Random();
int score = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println("点数: " + score);
if (score >= 80) {
System.out.println("優");
} else if (score >= 70) {
System.out.println("良");
} else if (score >= 60) {
System.out.println("可");
} else {
System.out.println("不可");
}
}
}
prob3-16.(難易度:★★)
import java.util.Random;
public class Problem3_16 {
public static void main(String[] args) {
Random random = new Random();
int number = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println("数値: " + number);
if (number % 2 == 0 && number % 3 == 0) {
System.out.println("2と3の公倍数です");
} else if (number % 2 == 0) {
System.out.println("2の倍数です");
} else if (number % 3 == 0) {
System.out.println("3の倍数です");
}
}
}
prob3-17.(難易度:★★)
import java.util.Random;
public class Problem3_17 {
public static void main(String[] args) {
Random random = new Random();
int number = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println("数値: " + number);
if (number <= 50 && number % 2 == 0) {
System.out.println("50以下の偶数です");
} else if (number <= 50) {
System.out.println("50以下です");
} else if (number % 2 == 0) {
System.out.println("偶数です");
}
}
}
prob3-18.(難易度:★★)
import java.util.Random;
public class Problem3_18 {
public static void main(String[] args) {
Random random = new Random();
int temperature = random.nextInt(46) - 10; // -10から35までの乱数を生成
System.out.println("摂氏" + temperature + "度");
if (temperature >= 30) {
System.out.println("真夏日です");
} else if (temperature >= 25) {
System.out.println("夏日です");
} else if (temperature < 0) {
System.out.println("真冬日です");
}
}
}
基本問題(3):繰り返し処理
prob4-1.(難易度:★)
import java.util.Random;
public class Problem4_1 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1; // 1から10までの乱数を生成
System.out.println("数: " + randomNumber);
for (int i = 0; i < randomNumber; i++) {
System.out.print("■");
}
System.out.println(); // 改行
}
}
prob4-2.(難易度:★)
import java.util.Random;
public class Problem4_2 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1; // 1から10までの乱数を生成
System.out.println("数: " + randomNumber);
int i = 0;
while (i < randomNumber) {
System.out.print("■");
i++;
}
System.out.println(); // 改行
}
}
prob4-3.(難易度:★)
import java.util.Random;
public class Problem4_3 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1; // 1から10までの乱数を生成
System.out.println("数: " + randomNumber);
int i = 0;
do {
System.out.print("■");
i++;
} while (i < randomNumber);
System.out.println(); // 改行
}
}
prob4-4(難易度:★)
public class Problem4_4 {
public static void main(String[] args) {
int a = 0;
while (a < 4) {
System.out.println("a = " + a);
a++;
}
}
}
prob4-5(難易度:★)
public class Problem4_5 {
public static void main(String[] args) {
for (int a = 0; a < 4; a++) {
System.out.println("a = " + a);
}
}
}
prob4-6(難易度:★)
public class Problem4_6 {
public static void main(String[] args) {
int a = 3;
while (a >= 0) {
System.out.println("a = " + a);
a--;
}
}
}
prob4-7(難易度:★)
public class Problem4_7 {
public static void main(String[] args) {
for (int a = 3; a >= 0; a--) {
System.out.println("a = " + a);
}
}
}
prob4-8.(難易度:★★)
import java.util.Random;
public class Problem4_8 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber;
while (true) {
randomNumber = random.nextInt(10) + 1; // 1から10までの乱数を生成
System.out.println(randomNumber);
if (randomNumber == 10) {
System.out.println("終了します");
break;
}
}
}
}
prob4-9.(難易度:★★)
import java.util.Random;
public class Problem4_9 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber;
while (true) {
randomNumber = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println(randomNumber);
if (randomNumber % 10 == 0) {
System.out.println("終了します");
break;
}
}
}
}
prob4-10.(難易度:★)
import java.util.Random;
public class Problem4_10 {
public static void main(String[] args) {
Random random = new Random();
for (int i = 0; i < 5; i++) {
int randomNumber = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println(randomNumber);
}
}
}
prob4-11.(難易度:★★)
import java.util.Random;
public class Problem4_11 {
public static void main(String[] args) {
Random random = new Random();
int maxNumber = 0;
for (int i = 0; i < 5; i++) {
int randomNumber = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println(randomNumber);
if (randomNumber > maxNumber) {
maxNumber = randomNumber;
}
}
System.out.println("最大値: " + maxNumber);
}
}
prob4-12.(難易度:★★)
import java.util.Random;
public class Problem4_12 {
public static void main(String[] args) {
Random random = new Random();
int minNumber = 101; // 最小値を初期化
for (int i = 0; i < 5; i++) {
int randomNumber = random.nextInt(100) + 1; // 1から100までの乱数を生成
System.out.println(randomNumber);
if (randomNumber < minNumber) {
minNumber = randomNumber;
}
}
System.out.println("最小値: " + minNumber);
}
}
prob4-13.(難易度:★★)
import java.util.Random;
public class Problem4_13 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1; // 1から10までの乱数を生成
if (randomNumber >= 5) {
for (int i = 0; i < randomNumber; i++) {
System.out.print("★");
}
} else {
System.out.println("発生した数値: " + randomNumber);
}
}
}
prob4-14.(難易度:★★)
import java.util.Random;
public class Problem4_14 {
public static void main(String[] args) {
Random random = new Random();
int randomNumber = random.nextInt(10) + 1; // 1から10までの乱数を生成
if (randomNumber % 2 == 0) {
for (int i = 0; i < randomNumber; i++) {
System.out.print("★");
}
} else {
for (int i = 0; i < randomNumber; i++) {
System.out.print("☆");
}
}
}
}
prob4-15.(難易度:★★)
public class Problem4_15 {
public static void main(String[] args) {
for (int i = 1; i <= 100; i++) {
System.out.print(i + " ");
if (i % 10 == 0) {
System.out.println(); // 10の倍数で改行
}
}
}
}
prob4-16.(難易度:★)
public class Problem4_16 {
public static void main(String[] args) {
for (int i = 1; i <= 9; i++) {
for (int j = 1; j <= 9; j++) {
System.out.print(i + "×" + j + "=" + (i * j) + " ");
}
System.out.println(); // 改行
}
}
}
prob4-17.(難易度:★★)
public class Problem4_17 {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
if (j <= i) {
System.out.print("■");
} else {
System.out.print("□");
}
}
System.out.println(); // 改行
}
}
}
prob4-18.(難易度:★★)
public class Problem4_18 {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10; j++) {
if (j == i) {
System.out.print("□");
} else {
System.out.print("■");
}
}
System.out.println(); // 改行
}
}
}
基本問題(4):配列変数
prob5-1.(難易度:★)
import java.util.Random;
public class Problem5_1 {
public static void main(String[] args) {
int[] a = new int[7];
Random random = new Random();
for (int i = 0; i < a.length; i++) {
a[i] = random.nextInt(10) + 1; // 1から10までの乱数を代入
System.out.print("a[" + i + "]=" + a[i] + " ");
}
}
}
prob5-2.(難易度:★)
public class Problem5_2 {
public static void main(String[] args) {
double[] d = {0.2, -5.1, 3.2, 1.8};
for (int i = 0; i < d.length; i++) {
System.out.print("d[" + i + "]=" + d[i] + " ");
}
}
}
prob5-3.(難易度:★★)
import java.util.Random;
public class Problem5_3 {
public static void main(String[] args) {
int[] data = new int[10];
Random random = new Random();
int evenCount = 0;
int oddCount = 0;
for (int i = 0; i < data.length; i++) {
data[i] = random.nextInt(100) + 1; // 1から100までの乱数を代入
System.out.print(data[i] + " ");
if (data[i] % 2 == 0) {
evenCount++;
} else {
oddCount++;
}
}
System.out.println("\n奇数 : " + oddCount);
System.out.println("偶数 : " + evenCount);
}
}
prob5-4.(難易度:★★)
import java.util.Random;
public class Problem5_4 {
public static void main(String[] args) {
int[] data = new int[100];
Random random = new Random();
int below50Count = 0;
int aboveOrEqual50Count = 0;
for (int i = 0; i < data.length; i++) {
data[i] = random.nextInt(10) + 1; // 1から10までの乱数を代入
System.out.print(data[i] + " ");
if (data[i] >= 50) {
aboveOrEqual50Count++;
} else {
below50Count++;
}
}
System.out.println("\n50以上の数 : " + aboveOrEqual50Count);
System.out.println("50未満の数 : " + below50Count);
}
}
prob5-5.(難易度:★★)
import java.util.Random;
public class Problem5_5 {
public static void main(String[] args) {
int[] data = new int[10];
Random random = new Random();
int multipleOf3Count = 0;
int notMultipleOf3Count = 0;
for (int i = 0; i < data.length; i++) {
data[i] = random.nextInt(10) + 1; // 1から10までの乱数を代入
System.out.print(data[i] + " ");
if (data[i] % 3 == 0) {
multipleOf3Count++;
} else {
notMultipleOf3Count++;
}
}
System.out.println("\n3の倍数 : " + multipleOf3Count);
System.out.println("3の倍数以外の数 : " + notMultipleOf3Count);
}
}
prob5-6.(難易度:★★)
import java.util.Random;
public class Problem5_5 {
public static void main(String[] args) {
int[] data = new int[10];
Random random = new Random();
int multipleOf3Count = 0;
int notMultipleOf3Count = 0;
for (int i = 0; i < data.length; i++) {
data[i] = random.nextInt(10) + 1; // 1から10までの乱数を代入
System.out.print(data[i] + " ");
if (data[i] % 3 == 0) {
multipleOf3Count++;
} else {
notMultipleOf3Count++;
}
}
System.out.println("\n3の倍数 : " + multipleOf3Count);
System.out.println("3の倍数以外の数 : " + notMultipleOf3Count);
}
}
prob5-7.(難易度:★★★)
import java.util.Random;
public class Problem5_7 {
public static void main(String[] args) {
int[] array = new int[5];
Random random = new Random();
int sum = 0;
int average;
int greaterThanAverage = 0;
int lessThanAverage = 0;
for (int i = 0; i < array.length; i++) {
array[i] = random.nextInt(10) + 1; // 1から10までの乱数を代入
System.out.print(array[i] + " ");
sum += array[i];
}
average = sum / array.length;
System.out.println("\n合計値:" + sum);
System.out.println("平均値:" + average);
for (int i = 0; i < array.length; i++) {
if (array[i] > average) {
greaterThanAverage++;
} else if (array[i] < average) {
lessThanAverage++;
}
}
System.out.println("\n平均値より大きい数:" + greaterThanAverage);
System.out.println("平均値より小さい数:" + lessThanAverage);
}
}
prob5-8.(難易度:★★)
import java.util.Random;
public class Problem5_8 {
public static void main(String[] args) {
int[] array = new int[5];
Random random = new Random();
int greaterThanZero = 0;
int lessThanZero = 0;
int equalToZero = 0;
for (int i = 0; i < array.length; i++) {
array[i] = random.nextInt(21) - 10; // -10から10までの乱数を代入
System.out.print(array[i] + " ");
if (array[i] > 0) {
greaterThanZero++;
} else if (array[i] < 0) {
lessThanZero++;
} else {
equalToZero++;
}
}
System.out.println("\n0より大きい数:" + greaterThanZero);
System.out.println("0より小さい数:" + lessThanZero);
System.out.println("0の個数:" + equalToZero);
}
}
prob5-9.(難易度:★★)
import java.util.Random;
public class Problem5_9 {
public static void main(String[] args) {
int[] array = new int[10];
Random random = new Random();
int aboveOrEqual50Count = 0;
int below50Count = 0;
for (int i = 0; i < array.length; i++) {
array[i] = random.nextInt(101); // 0から100までの乱数を代入
System.out.print(array[i] + " ");
if (array[i] >= 50) {
aboveOrEqual50Count++;
} else {
below50Count++;
}
}
System.out.println("\n50以上の数:" + aboveOrEqual50Count);
System.out.println("50未満の数:" + below50Count);
}
}
prob5-10.(難易度:★★)
import java.util.Random;
public class Problem5_10 {
public static void main(String[] args) {
int[] array = new int[7];
Random random = new Random();
for (int i = 0; i < array.length; i++) {
array[i] = random.nextInt(10) + 1; // 1から10までの乱数を代入
for (int j = 0; j < array[i]; j++) {
System.out.print("*");
}
System.out.println();
}
}
}
prob5-11.(難易度:★★)
import java.util.Random;
public class Problem5_11 {
public static void main(String[] args) {
int[] array = new int[5];
Random random = new Random();
for (int i = 0; i < array.length; i++) {
array[i] = random.nextInt(100) + 1; // 1から100までの乱数を代入
System.out.print(array[i] + " ");
}
System.out.println("\n\n0以上60未満:");
for (int i = 0; i < array.length; i++) {
if (array[i] >= 0 && array[i] < 60) {
System.out.print(array[i] + " ");
}
}
System.out.println("\n\n60以上80未満:");
for (int i = 0; i < array.length; i++) {
if (array[i] >= 60 && array[i] < 80) {
System.out.print(array[i] + " ");
}
}
System.out.println("\n\n80以上:");
for (int i = 0; i < array.length; i++) {
if (array[i] >= 80) {
System.out.print(array[i] + " ");
}
}
}
}
prob5-12.(難易度:★)
import java.util.Random;
public class Problem5_12 {
public static void main(String[] args) {
int[][]
matrix = new int[3][3];
Random random = new Random();
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
matrix[i][j] = random.nextInt(10); // 0から9までの乱数を代入
System.out.print(matrix[i][j] + " ");
}
System.out.println();
}
}
}
prob5-13.(難易度:★★)
import java.util.Random;
public class Problem5_13 {
public static void main(String[] args) {
int[][] matrix = new int[3][3];
Random random = new Random();
int max = Integer.MIN_VALUE;
int min = Integer.MAX_VALUE;
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) {
matrix[i][j] = random.nextInt(10); // 0から9までの乱数を代入
System.out.print(matrix[i][j] + " ");
if (matrix[i][j] > max) {
max = matrix[i][j];
}
if (matrix[i][j] < min) {
min = matrix[i][j];
}
}
System.out.println();
}
System.out.println("\n最大値:" + max);
System.out.println("最小値:" + min);
}
}
基本問題(5):クラスとオブジェクト
prob6-1.(難易度★)
package problem6;
public class Problem6_1 {
public static void main(String[] args) {
Minmax m = new Minmax();
int a = 4, b = 2, c = 6;
System.out.println(a + "と" + b + "と" + c + "のうち、最大のものは" + m.max(a, b, c));
System.out.println(a + "と" + b + "と" + c + "のうち、最小のものは" + m.min(a, b, c));
}
}
package problem6;
public class Minmax {
// 最大値の取得
public int max(int n1, int n2, int n3) {
int max = n1;
if (n2 > max) {
max = n2;
}
if (n3 > max) {
max = n3;
}
return max;
}
// 最小値の取得
public int min(int n1, int n2, int n3) {
int min = n1;
if (n2 < min) {
min = n2;
}
if (n3 < min) {
min = n3;
}
return min;
}
}
prob6-2.(難易度★)
package problem6;
public class Problem6_2 {
public static void main(String[] args) {
Calc c = new Calc();
double a = 4.0, b = 2.0;
System.out.println(a + " + " + b + " = " + c.add(a, b));
System.out.println(a + " - " + b + " = " + c.sub(a, b));
System.out.println(a + " * " + b + " = " + c.mul(a, b));
System.out.println(a + " / " + b + " = " + c.div(a, b));
}
}
package problem6;
public class Calc {
// 加算
double add(double a, double b) {
return a + b;
}
// 減算
double sub(double a, double b) {
return a - b;
}
// 乗算
double mul(double a, double b) {
return a * b;
}
// 除算
double div(double a, double b) {
if (b != 0) {
return a / b;
} else {
System.out.println("0で割ることはできません。");
return 0;
}
}
}
prob6-3.(難易度★)
package problem6;
public class Problem6_3 {
public static void main(String[] args) {
Circle c = new Circle();
// 円の半径を設定
c.r = 4.0;
System.out.println("半径" + c.r + "の円の円周の長さは" + c.circumference());
System.out.println("半径" + c.r + "の円の面積の長さは" + c.area());
}
}
package problem6;
public class Circle {
// 半径
public double r;
// 円周の長さを求める
public double circumference() {
return 2 * 3.14 * r;
}
// 面積を求める
public double area() {
return 3.14 * r * r;
}
}
基本問題(6):アクセス指定子とカプセル化
prob7-1.(難易度★)
package problem7;
public class Data {
// メンバ変数number
private int number = 0;
// メンバ変数comment
private String comment = "";
// numberのセッターメソッド
public void setNumber(int number) {
this.number = number;
}
// numberのゲッターメソッド
public int getNumber() {
return number;
}
// commentのセッターメソッド
public void setComment(String comment) {
this.comment = comment;
}
// commentのゲッターメソッド
public String getComment() {
return comment;
}
}
prob7-2.(難易度★)
package problem7;
public class TwoStrings {
// 一つ目の文字列
private String string1;
// 二つ目の文字列
private String string2;
// 一つ目の文字列を設定
public void setString1(String string1) {
this.string1 = string1;
}
// 二つ目の文字列を設定
public void setString2(String string2) {
this.string2 = string2;
}
// 一つ目の文字列を取得
public String getString1() {
return string1;
}
// 二つ目の文字列を取得
public String getString2() {
return string2;
}
// 二つの文字列を合成して返すメソッド
public String getConnectedString() {
return string1 + string2;
}
}
prob7-3.(難易度★)
package problem7;
public class Calculation {
// フィールド
private int number1;
private int number2;
// number1のセッターメソッド
public void setNumber1(int number1) {
this.number1 = number1;
}
// number2のセッターメソッド
public void setNumber2(int number2) {
this.number2 = number2;
}
// number1のゲッターメソッド
public int getNumber1() {
return number1;
}
// number2のゲッターメソッド
public int getNumber2() {
return number2;
}
// 二つの数の和を計算するメソッド
public int add() {
return number1 + number2;
}
// 二つの数の差を計算するメソッド
public int sub() {
return number1 - number2;
}
}