1.for循环:
public class test1 { public static void main(String[] args) { int sum=0; for (int i=1;i<=100;i++){ sum+=i; } System.out.println("sum="+sum); } }
2.while循环:
public class test1 { public static void main(String[] args) { int sum=0; int i=1; while (i<=100){ sum+=i; i++; } System.out.println("sum="+sum); } }