day03_01_流程概述与顺序结构
day03_02_选择结构_单if语句
day03_03_选择结构_标准if-else语句
day03_04_选择结构_扩展if-else语句
练习_用if语句实现考试成绩划分
public class Demo2 {
public static void main(String[] args) {
int score = 80;
if (score >= 90 && score <=100){
System.out.println("优秀");
}else if(score >=80 && score <90 ){
System.out.println("优");
}else if (score >=70 && score<80){
System.out.println("良");
}else {
System.out.println("不及格");
}
}
}
day03_06_练习_用if语句替换三元运算符
选择结构_标准的switch语句
public class Demo4 {
public static void main(String[] args) {
int num =3 ;
switch (num ){
case 1 :
System.out.println(1);
break;
case 3:
System.out.println(2);
break;
default:
System.out.println(1);
break;
}
}
}
day03_08_选择结构_穿透的switch语