java字符串编程题

import java.util.HashMap;
import java.util.Map;

public class CountCharNum {

/**
* JAVA编程题:字符串"yekmaakkccekymbvb",求出字符串中有多少种字符,以及每个字符的个数?
* 
*/
public static void main(String[] args) {

	String aString = "yekmaakkccekymbvb";
	int count = 0;
	String singleString = "";
	Map stringMap = new HashMap();
	for (int i = 0; i < aString.length(); i++) {
		singleString = String.valueOf(aString.charAt(i));
		System.out.println(singleString);
		CountCharNum ccn = new CountCharNum();
		// 第一次出现的字符	
		if (stringMap.get(singleString) == null) {
		    count = 0;
		} else {
		    count =  (Integer)stringMap.get(singleString);
		}
		stringMap.put(singleString, count + 1);
		}
		System.out.println(stringMap);
	}
}

public class StringSplit {

/**
* 编程：编写一个截取字符串的函数， 输入为一个字符串和字节数，输出为按字节截取的字符串。 但是要保证汉字不被截半个，如"我ABC"4，
* 应该截为"我AB"，输入"我ABC汉DEF"6， 应该输出为"我ABC"而不是"我ABC+汉的半个"。
* 
* @param args
*/
String splitString;
int splitBytes;

public StringSplit(String splitString, int splitBytes) {
	super();
	this.splitString = splitString;
	this.splitBytes = splitBytes;
	System.out.println("The string is : " + splitString
		+ ",the splitbytes is :" + splitBytes);
	}

public void splitIt() {
	int num = 0;
	StringBuffer sb = new StringBuffer();
	int i = 0;
	if (splitBytes >= 2) {
	     while (num < splitBytes) {
		if (splitString.substring(i, i + 1).matches("[\u4e00-\u9fa5]+")) {
		    num += 2;
		} else {
		    num++;
		}
		sb.append(splitString.substring(i, i + 1));
		i++;
		}
		System.out.println("final string :" + sb.toString());
	}
}

public static void main(String[] args) {
	StringSplit ss = new StringSplit("我ABCD妈E爸F", 5);
	ss.splitIt();
    }
}

package com.searchkiller;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class AlphaAsc {

	/**Java编程题:字符串sbc，fds,des按字母的升序输出
	 * @param args
	 */
	public static void main(String[] args) {

		String[] aString = {"sbc","fds","des"};

		List list = new ArrayList();
		for (int i = 0; i < aString.length; i++) {
			list.add(aString[i]);
		}
		Collections.sort(list);
		System.out.println(list);
	}

}