Character源码

package com.song.source.java;public class CharacterDemo {private final char value;public CharacterDemo(char value) {this.value = value;}/**  * 字符缓存  */  private static class CharacterCache {private CharacterCache(){}/**  * 声明缓存的大小  */  static final CharacterDemo cache[] = new CharacterDemo[127 + 1];/**  * 类加载时，缓存字符数据  */  static {for (int i = 0; i < cache.length; i++)cache[i] = new CharacterDemo((char)i);}}/**  * 如果字符小于127,则取缓存中对应的数据  * @param c  * @return  */  public static CharacterDemo valueOf(char c){if(c <= 127){return CharacterCache.cache[(int)c];}return new CharacterDemo(c);}/**  * 比较两个字符的大小，实际就是做差  * @param x  * @param y  * @return  */  public static int compare(char x,char y){return x - y;}/**  * 将一个字符转变成字符串  * @return  */  public String toString(){char buf[] = {
   value};return String.valueOf(buf);}/**  * 将一个字符转变成字符串  * @param c  * @return  */  public static String toString(char c){return String.valueOf(c);}/**  * 判断与传入的字符是否相等  * @param anObject  * @return  */  public boolean equals(Object anObject){if(anObject instanceof CharacterDemo){return value ==  ((CharacterDemo)anObject).charValue();}return false;}/**  * 返回char的字符  * @return  */  public char charValue(){return value;}}