两数互换

Change.java

public class Change{
	public static void main(String[] args){
		int a=5;
		int b=7;
		a=a+b;
		b=a-b;
		a=a-b;
		
		System.out.println(a);
		System.out.println(b);
		
	}
}

Test.java

public class Test{
	public static void main(String[] args){
		java.util.Scanner input=new java.util.Scanner(System.in);
			System.out.println("请输入A的值：");
			int A=input.nextInt();
			System.out.println("请输入B的值：");
			int B=input.nextInt();
			int C=A;
			A=B;
			B=C;
			System.out.println("输出A的值="+A);
			System.out.println("输出B的值="+B);
	}
}