1.While 循环
public class WhileTest
{
public static void main(String[] args)
{
int a = 1;//循环变量
int sum = 0;//存储相加后的结果
while(a <= 100)
{
sum += a;
a++;
}
System.out.println(sum);
}
}
2.do...while 循环
public class DoWhileTest
{
public static void main(String[] args)
{
/*
int a = 1;
int sum = 0;
do
{
sum += a;
a++;
}
while(a <= 100);
System.out.println(sum);
*/
int a = 2;
int sum = 0;//存储相加后的结果
do
{
sum += a;
a += 2;
}
while(a <= 100);
System.out.println(sum);
int b = 2;
while(b < 1)
{
System.out.println("Hello World");
}
do
{
System.out.print("Welcome");
}
while(b < 1);
}
}
3.for 循环
public class ForTest
{
public static void main(String[] args)
{
int sum = 0;
for(int i = 1; i <= 100; i++)
{
sum += i;
}
System.out.println(sum);
int sum2 = 0;
for(int i = 100;i >= 1; i -= 2)
{
sum2 += i;
}
System.out.println(sum2);
}
}