Java基础-- if else语句入门小练习

入门基础练习

练习一练习二练习三练习四

package ifDemo;

public class Test1 {
    public static void main(String[]args){
        
        int i=16;
        

        
        if(i%2==0){
            System.out.println("是偶数");
        }else{
            System.out.println("是奇数");
        }

    }
}

package ifDemo;

public class Test2 {
    public static void main(String[] args) {
        

        

        int i=15;
        if(i%3==0 && i%5==0){ //或者i%15==0
            System.out.println("乒乓");
        }else if(i%5==0){
            System.out.println("乓");
        }else if(i%3==0){
            System.out.println("乒");
        }else{
            System.out.println(i);
        }
    }
}

package ifDemo;

public class Test3 {
    public static void main(String[] args) {
        
        

        int month=8;
        if(month==3 || month==4 || month==5){  //或者 3<=month && month<=5
            System.out.println("春季：春眠不觉晓");
        }else if(month==6 || month==7 || month==8){ //或者 6<=month && month<=8
            System.out.println("夏季：夏天蚊子咬");
        }else if(month==9 || month==10 ||month==11){ //或者 9<=month && month<=11
            System.out.println("秋季：秋天一身包");
        }else if(month==12 || month==1 || month==2){
            System.out.println("冬季：蚊子死翘翘");
        }else{
            System.out.println("月份有误");
        }
    }
}

package ifDemo;

public class Test4 {
    public static void main(String[] args) {
        
        int year=2020;
        int month =2;
        if(month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12){
            System.out.println("31天");
        }else if(month==4 || month==6 || month==9 || month==11){
            System.out.println("30天");
        }else if(month==2 && year%4==0){
            System.out.println("29天");
        }else if(month==2 && year%4!=0){
            System.out.println("28天");
        }else{
            System.out.println("月份有误");
        }

    }
}