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(b);
//字符串连接符 + ,String
System.out.println(""+a+b);
System.out.println(a+b+"");
}
}
package operator;
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 = 70;
String type = score < 60 ? "不及格":"及格"; //必须掌握
//if
System.out.println(type);
}
}