狂神说--基础语法--三元运算符及字符串连接符

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);

        //字符串连接符 + ,string +在前面会+ 在后面会追加
        System.out.println(a+b);
        System.out.println(""+a+b);
        System.out.println(a+b+"");

    }
}

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";//必须掌握
        // if
        System.out.println(type);
    }
}