压缩字符串代码实现（xxxyyz

压缩字符串代码实现（xxxyyz

通过键盘输入一串小写字母（a-z）组成的字符串。请编写一个字符串压缩程序。 将字符串中连续出现的重复字母进行压缩，并输出压缩后的字符串。

1.仅压缩连续重复出现的字符。比如字符串“abcbc”,由于无连续重复字符，压缩后的字符串还是“abcbc”。

2.压缩字段的格式为：字符重复的次数+字符。例如：字符串："xxxyyyyyyz"压缩后就成为"3x6yz"。

public static void main(String[]args){Scanner scanner = new Scanner(System.in);String str = "";System.out.println("请输入一串字符：");str = Line();String result = compressLetters(str);System.out.println("压缩前的字符串："+str);System.out.println("压缩后的字符串："+result);
}

public static String compressLetters(String letters){String resultStr = "";if (!StringUtil.isBlank(letters)){char[] strArry = CharArray();int index = 0;String mb = String.valueOf(strArry[0]);for (char c:strArry){if (mb.equals(String.valueOf(c))){index ++;}else {if (index == 1){resultStr += mb;}else {resultStr += index + mb;}mb = String.valueOf(c);index = 1;}}if (index == 1){resultStr += mb;}else {resultStr += index + mb;}}return resultStr;
}

但是这样还不完美，因为有可能输入的是大写字母。所以加了判断大小写字母的方法：

/*** 通过键盘输入一窜小写字母（a-z）组成的字符串。请编写一个字符串压缩程序。* 将字符串中连续出现的重复字母进行压缩，并输出压缩后的字符串。* Created by chenying on 2018/11/26.*/
public class SuanFa8 {public static void main(String[]args){Scanner scanner = new Scanner(System.in);String str = "";System.out.println("请输入一串字符：");str = Line();String result = compressLetters(str);System.out.println("压缩前的字符串："+str);System.out.println("压缩后的字符串："+result);}public static String compressLetters(String letters){String resultStr = "";if (!StringUtil.isBlank(letters)){char[] strArry = CharArray();int index = 0;if (isUpperCase(strArry[0])){System.out.println("请输入小写字母！");return null;}String mb = String.valueOf(strArry[0]);for (char c:strArry){if (mb.equals(String.valueOf(c))){index ++;}else {if (index == 1){resultStr += mb;}else {resultStr += index + mb;}if (Character.isUpperCase(c)){System.out.println("请输入小写字母！");return null;}mb = String.valueOf(c);index = 1;}}if (index == 1){resultStr += mb;}else {resultStr += index + mb;}}return resultStr;}public  static boolean isUpperCase(char c) {return c >= 65 && c <= 90;}public static boolean isLowerCase(char c) {return c >= 97 && c <= 122;}
}