方法一：引入第三方變數

public class ChangeVar{
	public static void main(String[] args){
		//交換變數
		 int a = 1;
		int b = 2;
		int c= a; //1
		a = b;//2
		b = c; //1
        System.out.println(a);//2
		System.out.println(b);//1
	}
}

方法二：通過算術運算子實現

public class ChangeVar{
	public static void main(String[] args){
		//交換變數
		int a = 1;
		int b = 2;
		a = a+b;//3
		b = a-b;//1
		a = a-b;//2
        System.out.println(a);//2
		System.out.println(b);//1
	}
}
 

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