7.字符串连接符和三元运算符

package com.ding.operator;

public class Demo07 {
public static void main(String[] args) {
int a = 10;
int b = 20;

a+=b;//a = a+b
a-=b;//a = a-b
System.out.println(a);

//字符串连接符 +, string
System.out.println(""+a+b);
System.out.println(a+b+"");
}
}

package com.ding.operator;
//三元运算符
public class Demo08 {
public static void main(String[] args) {
// x ? y ：z
//如果x==true，否则结果为z

int score = 80;
String type = score <60 ?"不及格":"及格";//必须掌握
System.out.println(type);
}
}