double d=84.54;

d++;

Int c=d/2;

int year=2046;

if(!(year%2==0)){

if(year/10==0){

System.out.println(“进入了if”);

}

}else{

System.out.println(“进入了else”);

}

System.out.println(“退出”);

Public class Weather

public static void mian(String[] args){

int shiDu=45;

if(shiDu>=80){

System.out.println(“要下雨了”)

}else if(shiDu>=50){

System.out.println(“天很阴”)

}else if(shiDu>=30){

System.out.println(“很舒适”)

}else if(shiDu>=0){

System.out.println(“很干燥”)

}

}

}

Int day=3;

Switch(day){

Case 1:

Case 3:

Case 5:

System.out.println(“学钢琴！”);

Break;

Case 2:

System.out.println(“学英语！”);

Default:

System.out.println(“休息哦！”);

}

Public class Test{

public static void main(String[] args){

int i=2;

Do{

if(i%2==0){

System.out.println(“*”);

}else{

System.out.println(“#”);

}

i++；

}while（i<7）；

Int k=10;

While(k==0){

k=k-1;

}

Int a=0;

While(a<5){

switch(a){

Case 0:

Case 3:a=a+2;

Case 1:

Case 2:a=a+3;

}

}