1、(1)求和
class Demo_Sum
{
public static void main(String[] args)
{
int sum = 0;
for (int i=1;i<=10;i++ ){
sum+=i;
}
System.out.println("sum="+sum);
}
}
(2)求偶数和
class Demo1_Sum
{
public static void main(String[] args)
{
int sum=0;
for (int i=1;i<=100;i++ ){
if (i%2==0){
sum+=i;
}
}
System.out.println("sum="+sum);
}
}
(3)求奇数和
class Demo2_Sum
{
public static void main(String[] args)
{
int sum=0;
for (int i=1;i<=100 ;i++ ){
if (i%2==1){
sum+=i;
}
}
System.out.println("sum="+sum);
}
}
(4)打印水仙花
class Demo_Flower
{
public static void main(String[] args)
{
for (int i=100;i<=999 ;i++ ){
int ge = i%10;
int shi = i/10%10;
int bai = i/100%10;
if (ge*ge*ge+shi*shi*shi+bai*bai*bai==i){
System.out.println("i="+i);
}
}
}
}
(5)统计水仙花
class Demo1_Flower
{
public static void main(String[] args)
{
int count = 0;
for (int i=100;i<=999 ;i++ ){
int ge = i%10;
int shi = i/10%10;
int bai = i/100%10;
if (ge*ge*ge+shi*shi*shi+bai*bai*bai==i){
count++;
}
}
System.out.println("count="+count);
}
}
(6)九九乘法表
class Demo_For99
{
public static void main(String[] args)
{
for (int i=1;i<=9 ;i++ ){
for (int j=1;j<=i ;j++ ){
System.out.print(j+"*"+i+"="+i*j+" ");
}
System.out.println();
}
}
}
2、while(循环条件){
语句1;
语句2;
……
循环条件更改;
}
3、break 结束循环
continue 结束本次循环
return 结束方法