不少程序员都会碰到的三个面试题

来源：互联网发布：网络现在最火的歌编辑：程序博客网时间：2024/04/29 13:20

面试问题如下：

1. 求从10到100中能被3或5整除的数的和

int sum = 0; for(int i = 10; i <= 100; i++) if( i % 3 == 0 || i % 5 == 0) sum += i; System.out.println(sum);

2. 将一个字符串逆序，不要使用反转函数

String message = \"he saw a racecar\"; StringBuilder rev = new StringBuilder(); for(int i = message.length()-1; i >= 0; i--) rev.append(message.charAt(i)); System.out.println(rev.toString());

3. 反转一个栈

<pre class="\"brush:" java;="" gutter:="" true\"="" style="white-space: pre-wrap; word-wrap: break-word; line-height: 32px; background-color: rgb(255, 255, 255);">import java.util.*;public class MyProgram extends com.ktbyte.submit.Coder { public static void main(String[] args) { Stack items = new Stack(); items.push(\"he\"); //he is at the bottom of the stack items.push(\"saw\"); items.push(\"a\"); items.push(\"racecar\"); reverseStack(items); //now he is at the top //print in order pushed: while(items.size()>0) System.out.println(items.pop()); } public static void reverseStack(Stack stack) { Queue rev = new LinkedList(); while(stack.size()>0) rev.offer(stack.pop()); while(rev.size()>0) stack.push(rev.poll()); }}

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