本文主要是介绍字符串反转 + 统计字符串中小字符串出现的次数，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
package homework;import java.util.Scanner;/*** 编程题:1: 字符串反转举例：键盘录入”abc” 输出结果：”cba”**/public class BianChengTi1 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);System.out.println("请输入一个字符串");String s = sc.nextLine();StringBuffer sb = new StringBuffer(s) ;String str = sb.reverse().toString();System.out.println("结果:"+str);}}
package homework;import java.util.Scanner;/*** 2:统计大串中小串出现的次数举例：在字符串"woaijavawozhenaijavawozhendeaijavawozhendehenaijavaxinbuxinwoaijavagun"结果：java出现了5次**/public class BianChengTi2 {public static void main(String[] args) {String str1 ="woaijavawozhenaijavawozhendeaijavawozhendehenaijavaxinbuxinwoaijavagun";Scanner sc = new Scanner(System.in);System.out.println("请输入需要查找的字符串");String str2 = sc.nextLine();int sum = sum(str1,str2);System.out.println("该字符串出现的次数为:"+sum);}public static int sum(String s1,String s2) {int sum = 0;int index = s1.indexOf(s2);while(index!=-1) {sum++;int start = index + s2.length();s1 = s1.substring(start);index = s1.indexOf(s2);}return sum;}}
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