Java基础-

入门基础练习

练习一练习二练习三练习四 练习一

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"); } }}