1.3.1变量与计算：读输入

1.3.1变量与计算：读输入
package hello;

import java.util.Scanner;

public class Hello {

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out .println(“你好”);
Scanner in =new Scanner(System.in);
System.out.print(“echo:”+in.nextLine());
}

}

Alt+/:可以找到想写的代码；
+可以连接两个字符串；
要习惯用键盘做；
ctrl+/:注释：相当于计算机内不存在；

package hello;
import java.util.Scanner;
public class Hello {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out .println(“你好”);
Scanner in =new Scanner(System.in);
//System.out.print(in.nextLine());
//System.out.print(“echo:”+in.nextLine());
System.out.print(“2+3=”+5);
}
}

package hello;
import java.util.Scanner;
public class Hello {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out .println(“你好”);
Scanner in =new Scanner(System.in);
//System.out.print(in.nextLine());
//System.out.print(“echo:”+in.nextLine());
System.out.print(“2+3=”+(2+3));
}
}