Java学习----反复做某件事情
for循环:
public class TestFor{ public static void main(String[] args){ for(int x = 1; x < 3; x++) { System.out.println(x); } } }
计算1+2+3...+100的值
public class TestFor{ public static void main(String[] args){ int sum = 0; // 计算1+2+.....+100的值 for(int x = 1; x <= 100; x++) { sum = sum + x; // sum += x } System.out.println(sum); } }
while循环:
public class TestWhile{ public static void main(String[] args){ int x = 1; /* while (x <= 3) { System.out.println(x); if (x == 1) { continue;//死循环1 } x++; if (x == 2) { break;//终止循环 } } */ do { System.out.println(x); x++; }while(x <= 3); System.out.println("循环结束"); } }