for (int i = 1;i <= 100;i++){
System.out.println(i);
}
使用while循环输出1-100
int j = 1;
while (j <= 100){
System.out.println(j);
j++;
}
使用do......while输出1-100
int k = 1;
do{
System.out.println(k);
k++;
}
while(k <= 100);
