条件运算符
? :
package operator;
//三元运算符
public class Demo08 {
public static void main(String[] args) {
// x ? y : z
//如果x==true,则结果为y,否则结果为z
int score = 80;
String type = score <60 ?"不及格":"及格";
System.out.println(type);//及格
score = 50;
String typa = score <60 ?"不及格":"及格";//必须掌握
System.out.println(typa);//不及格
//if
}
}
拓展运算符
package 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);
System.out.println(a+b);
//字符串链接符 + ,String【直接链接】
System.out.println(""+a+b);
System.out.println(a+b+"");//后面不会拼接
}
}