方法一

public class Test2 {

public static void main(String[] args){

java.util.Scanner input = new java.util.Scanner (System.in);

System.out.println("簡(jiǎn)單數(shù)值交換小程序");

System.out.println("請(qǐng)輸入第一個(gè)數(shù)值");

int a = input.nextInt();

System.out.println("請(qǐng)輸入第二個(gè)數(shù)值");

int b = input.nextInt();

int c ;

c = a;

a = b;

b = c;

System.out.println("交換后第一個(gè)數(shù)的值為：" + a + "? " + "第二個(gè)數(shù)的值為：" + b);

}

}

方法二

public class Test4{

public static void main (String[]args){

java.util.Scanner input = new java.util.Scanner (System.in);

System.out.println("請(qǐng)輸入第一個(gè)函數(shù)值");

int a = input.nextInt();

System.out.println("請(qǐng)輸入第二個(gè)函數(shù)值");

int b = input.nextInt();

a = b - a;

b = b - a;

a = a + b;

System.out.println("第一個(gè)函數(shù)值：" + a);

System.out.println("第二個(gè)函數(shù)值：" + b);

}

}