有趣的题

来源：互联网发布：淘宝助理在什么地方编辑：程序博客网时间：2024/04/29 19:13

1.实现一个方法将一个字符串的奇数位取出，如传的是ahbhchd，就返回abcd

public class Test {public static void main(String args[]) {Test t = new Test();String result = t.getJiShuChuan("ahbhchdhehf");System.out.println(result);}public String getJiShuChuan(String src) {StringBuffer buffer = new StringBuffer(src);int len = buffer.length();if (len > 1) {for (int i=1;i<len;i++,len--) {buffer.deleteCharAt(i);}}return buffer.toString();}}

2.输出一个菱形

public class Test2 {public static void main(String args[]) {Test2 t = new Test2();t.print(25);}public void print(int n) {for (int i = 0; i < n / 2; i++) {int num1 = (i + 1) * 2 - 1;int num2 = (n - num1) / 2;printSpace(num2);printNum(num1);printSpace(num2);System.out.println();}printNum(n);System.out.println();for (int i=n/2;i>0;i--) {int num1 = 2*i - 1;int num2 = (n-num1)/2; printSpace(num2);printNum(num1);printSpace(num2);System.out.println();}}private void printSpace(int n) {for (int i = 0; i < n; i++) {System.out.print("  ");}}private void printNum(int n) {for (int i = 0; i < n; i++)System.out.print(" *");}}

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