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論理演算子の評価について

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論理演算子の評価方法

特にインクリメント・デクリメント時には注意が必要

Increment.java
public class Increment {

    public static void main(String[] args) {
        int x = 10;
        int y = 10;

        if (x >= 10 && ++y >= 10) {
            //xがfalseならyを評価しない
            System.out.println("x = " + x);
            System.out.println("y = " + y);
        }
        System.out.println("------");

        if (x >= 10 || ++y >= 10) {
            //xがtrueならyを評価しない
            System.out.println("x = " + x);
            System.out.println("y = " + y);
        }
        System.out.println("------");

        if (x >= 10 | ++y >= 10) {
            //xがtrueでもyを評価する
            System.out.println("x = " + x);
            System.out.println("y = " + y);
        }
        System.out.println("------");

        if (x > 10 & ++y > 10) {
            //xがfalseでもyを評価する
            System.out.println("nothing");
        }

        System.out.println("x = " + x);
        System.out.println("y = " + y);
    }

}
x = 10
y = 11
------
x = 10
y = 11
------
x = 10
y = 12
------
x = 10
y = 13
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