两个数字互换

Test.java

public class Test {

	
	public static void main(String[] args) {
		
		java.util.Scanner input = new java.util.Scanner(System.in);
		
		System.out.println("请输入数字A:");
		int numA = input.nextInt();
		
		System.out.println("请输入数字B:");
		int numB = input.nextInt();
		
		
		int temp = numA;
		numA = numB;
		numB = temp;
		
		System.out.println("NumA :" + numA);
		System.out.println("NumB :" + numB);
		
	}
}

Test2.java

public class Test {

	
	public static void main(String[] args) {
		
		java.util.Scanner input = new java.util.Scanner(System.in);
		
		System.out.println("请输入数字A:");
		int numA = input.nextInt();
		
		System.out.println("请输入数字B:");
		int numB = input.nextInt();
		
		
		numA = numA + numB;
		numB = numA - numB;
		numA = numA - numB;
		
		System.out.println("NumA :" + numA);
		System.out.println("NumB :" + numB);
		
	}
}