Question

JAVA编程 要有Scanner，if else 语句

输入两个整数，放入到变量a和b中， 如果a大于等于b,把a和b的值进行交换， 否则就不交换，最后输出a和b的值
用 if else 语句，要有Scanner

Answer 1

public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        if (a >= b) {
            int temp = a;
            a = b;
            b = temp;
            System.out.println("a = " + a);
            System.out.println("b = " + b);
        } else {
            System.out.println("a = " + a);
            System.out.println("b = " + b);
        }
        scan.close();
    }

Answer 2

int a = 0;
int b = 0;
int temp = 0;
Scanner scanner = new Scanner(System.in);
System.out.println("输入两个整数数a,b");
a = scanner.nextInt();
b = scanner.nextInt();
if (b < a) {
temp = a;
a = b;
b = temp;
}
System.out.println(a + " " + b);
随意写了一下，您看是否对您有所帮助

Answer 3

package ScannerTest;

import java.util.Scanner;

public class ScannerTest {
	
	public static void main(String[] Args){
		Scanner scanner = new Scanner(System.in); 
		int temp = 0;
		System.out.println("a=");
		int a = scanner.nextInt();
		System.out.println("b=");
		int b = scanner.nextInt();
		if(a>b){
			temp = a;
			a = b;
			b = temp ;
		}else{
			
		}
		System.out.println("a = "+ a +"\n1b = "+ b);
	}
	
}