Java编程-基本输入输出语句

package Hello;

 

import java.util.Scanner;

 

public class Hello {

     public static void main(String[] args){

     System.out.println("你好世界！");

     //Scanner in = new Scanner(System.in);

     //System.out.println("echo："+in.nextLine());

     System.out.println("2+3=" + 5);  //输出 2+3=5

     System.out.println("2+3="+(2+3));//输出2+3=5

     System.out.println("2+3="+2+3);//输出2+3=23

     System.out.println(2+3+"=2+3");//输出2=2+3

     }

}