別の関数で使ってた変数？を持ってきたい

TextQuestCard adventure(TextQuestCard[] monster, TextQuestCard[] player) {
		int random_adventure = (int)(Math.random()*100) + 1;
		if(1 <= random_adventure && random_adventure <= 10) {
			/*何もなかった*/
			System.out.println("今日は何も見つからなかった。");
			player[0].hitPoint = player[0].hitPoint + (player[0].maxHitPoint*10)/100;
			return player[0];
		}
		else if(11 <= random_adventure && random_adventure <= 100) {
			/*モンスターに出くわす*/
			int monsterCount = 0;
			for(int i = 0; i <= 20; i++) {
				if(monster[i].conditionsPoint <= player[0].level) {
					monsterCount++;
					//当てはまったモンスターの番号を格納する配列作る
					 int[] monsterList = new int[21];
					 monsterList[monsterCount] = i;
				}
			}	
			int random_monster = (int)(Math.random()* monsterCount);
			System.out.println(monster[random_monster].name + "に出くわした！");
			return monster[random_monster];
		}
		return null;
	}
	
	Integer fight(TextQuestCard[] monster, TextQuestCard[] player) {
		TextQuestCard across = adventure(monster, player);
		
		int battlestart = 0;
		int MyTurn = 0; 
		int EnemyTurn = 0;
		
		if(battlestart == 0) {
			if(player[0].speed >= across.speed) {
				MyTurn = 1 ; 
				EnemyTurn = 0;
			}
			else {
				MyTurn = 0 ; 
				EnemyTurn = 1;
			}
			battlestart = 1;
		}
		
		for(int i = 1; i <= 15; i++) {
			if(MyTurn == 1) {
				/////////////////////自分のターンが先行////////////////////////////

				//////////////////////戦闘エフェクト//////////////////////////////
				System.out.println(player[0].name + "の攻撃");
				//////////////////////ダメージ計算////////////////////////////////
				across.hitPoint = across.hitPoint - player[0].atkPoint;
				System.out.println(across.name + "に" + player[0].atkPoint + "のダメージ");
				if(across.hitPoint <= 0) {
					System.out.println(across.name + "を倒した！");
					return across.exPoint;
				}
				System.out.println(across.name + "の攻撃");
				player[0].hitPoint = player[0].hitPoint - across.atkPoint;
				System.out.println(player[0].name + "は" + across.atkPoint + "のダメージ");
				if(player[0].hitPoint <= 0) {
					System.out.println(player[0].name + "は倒れてしまった！");
					return 0;
				}
				
			}
			
			if(EnemyTurn == 1) {
				/////////////////////相手ターンが先行////////////////////////////

				//////////////////////戦闘エフェクト//////////////////////////////
				System.out.println(across.name + "の攻撃");
				//////////////////////ダメージ計算////////////////////////////////
				player[0].hitPoint = player[0].hitPoint - across.atkPoint;
				System.out.println(player[0].name + "は" + across.atkPoint + "のダメージ");
				if(player[0].hitPoint <= 0) {
					System.out.println(player[0].name + "は倒れてしまった！");
					return 0;
				}
				
				System.out.println(player[0].name + "の攻撃");
				across.hitPoint = across.hitPoint - player[0].atkPoint;
				System.out.println(across.name + "に" + player[0].atkPoint + "のダメージ");
				if(across.hitPoint <= 0) {
					System.out.println(across.name + "を倒した！");					
					return across.exPoint;

				}	
			}
		}
		return null;
	}

TextQuestCard levelUp(TextQuestCard[] player, TextQuestCard[] monster) {
		Integer across = fight(monster, player);

		double levelUpPoint = 1;
		
		if(player[0].level >= 2) {
			for(int i = 1; i <= player[0].level; i++) {
				levelUpPoint = levelUpPoint * 1.5;
			}
		}
		
		player[0].exPoint = player[0].exPoint + across.exPoint;
		int count = 0;
		for(int j = 1; player[0].exPoint < levelUpPoint; j++) {
			if(levelUpPoint <= player[0].exPoint) {
				player[0].exPoint = (int)(player[0].exPoint - levelUpPoint);
				player[0].level = player[0].level + 1;
				count++;
			}
		}
		System.out.println("レベルが" + count + "上がった");
		return player[0];
	}