java.lang.AbstractStringBuilder分析摘要：
<1>offsetByCodePoints（int index, int codePointOffset）
<2>getChars（int srcBegin, int srcEnd, char[] dst, int dstBegin）
<3>setCharAt（int index, char ch）方法
<4>append重载方法
1.offsetByCodePoints（int index, int codePointOffset）
该方法是用于获取某个Unicode解码值在字符缓存区的下标位置。
public int offsetByCodePontes(int index, int codePointOffset){
if(index<0 || index >count){
throw new IndexOutOfBoundsException();
}
return Character.offsetByCodePointsImpl(value, 0,
count, index, codePointOffset);
}
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这个方法是的属性有：public公有的。
参数：index
参数说明：从某个位置开始查找
参数：codePointOffset
参数说明：Unideco值，用于查找对应的解码值。
返回值：intl类型
返回值说明：Unicode解码值，查找对应的编码在字符中的位置。
该方法的主要作用是：返回指定位置的char字符的前一位字符的Unixode的解码值。
2. getChars（int srcBegin, int srcEnd, char[] dst, int dstBegin）
该方法的作用是将字符缓存区的字符复制到一个数组中dst中。
public void getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin){
if(srcBegin < 0){
throw new StringIndexOutOfBoundsException(srcBegin);
}
if((srcEnd<0) || (srcEnd>count)){
throw new StringIndexOutOfBoundsException(srcEnd);
}
if(srcBegin > srcEnd){
throw new StirngIndexOutOfBoundsException("srcBegin > srcEnd");
}
System.arraycopy(value, srcBegin, dst, dstBegin, srcEnd-srcBegin);
}
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这个方法是的属性有：public公有。
参数：srcBegin
参数说明：要复制的开始位置（基于this而言）
参数：srcEnd
参数说明：复制的结束位置（基于this而言）
参数：dst
参数说明：char数组，将this字符复制后存放的数组。
参数：dstBegin
参数说明：dst数组存放this的复制字符，其存在的开始位置。
异常：StringIndexOfBoundsException
异常说明：如果传入的下标位置不合法，就会抛出该异常。
返回值：int
返回值说明：返回给定坐标之间的的字符串的Unicode解码数量。
3.setCharAt（int index, char ch）方法
该方法的作用是设置字符串缓存区的字符，将制定的位置的字符替换新字符。
public void setCharAt(int index, char ch){
if((index<0)||(index>=count)){
throw new StringIndexOutOfBoundsException(index);
}
value[index] = ch;
}
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这个方法是的属性有：public公有。
参数：index
参数说明：int类型，替换的下标位置
参数：ch
参数说明：char类型，将制定位置替换成该字符。
异常：StringIndexOfBoundsException
异常说明：如果输入的实参index下标位置不存在，则抛出此异常。
该方法的主要作用是：该方法的作用是设置字符串缓存区的字符，将制定的位置的字符替换新字符。
4. append重载方法
该方法的作用是在字符缓存后面添加内容，这也是这个抽象类中最重要的方法之一。
public AbstractStringBuilder append(Object obj){
return append(String.valueOf(obj));
}
public AbstractStringBuilder append(String str){
if(str == null){
return appendNull();
}
int len = str.length();
ensureCapacityInternal(count+length);
str.getChars(0, len, value, count);
count += len;
return this;
}
public AbstractStringBuilder append(StringBuffer sb){
if(sb == null){
return appendNull();
}
int len = sb.length();
ensureCapacityInternal(count+len);
sb.getChars(0, len, value, count);
count += len;
return this;
}
AbstractStringBuilder append(AbstractStringBuilder asb){
if(asb == null){
return appendNull();
}
int len = asb.length();
ensureCapacityInternal(count+len);
asb.getChar(0, len, value, count);
count += len;
return this;
}
public AbstractStringBuilder append(CharSequence s){
if(s == null){
return appendNull();
}
if(s instanceof String){
return this.append((String)s);
}
if(s instanceof AbstractStringBuilder){
return this.append((AbstractStringBuilder)s);
}
return this.append(s, 0, s.length());
}
public AbstractStringBuilder append(CharSequence s, int start, int end){
if(s == null){
s = "null";
}
if((start<0)||(start>end)||(end>s.length())){
throw new IndexOutOfBoundsException("start"+start+",end"
+end+",s.length()"+s.length());
}
int len = end - start;
ensureCapacityInternal(count+len);
for(int i=start,j=count; i<end; i++,j++){
value[j] = s.charAt(i);
}
count += len;
return this;
}
public AbstractStringBuilder append(char[] str){
int len = str.length;
ensureCapacityInternal(count+len);
System.arraycopy(str, 0, value, count, len);
count += len;
return this;
}
public AbstractStringBuilder append(boolean b){
if(b){
ensureCapacityInternal(count+4);
value[count++] = 't';
value[count++] = 'u';
value[count++] = 'r';
value[count++] = 'e';
}else{
ensureCapacityInternal(count+5);
value[count++] = 'f';
value[count++] = 'a';
value[count++] = 'l';
value[count++] = 's';
value[count++] = 'e';
}
return this;
}
public AbstractStringBuilder apeend(char c){
ensureCapacityInternal(count+1);
value[count++] = c;
return this;
}
public AbstractStringBuilder append(int i){
if(i == Integer.MIN_VALUE){
append("-2147483648");
return this;
}
int appendLength = (i<0)?Integer.StringSize(-i)+1
: Integer.StringSize(i);
int spaceNeeded = count + appendLength;
ensureCapacityInternal(spaceNeeded);
Integer.gerChars(i,spaceNeed,value);
count = spaceNeeded;
return this;
}
public AbstractStringBuilder append(long l){
if(l == Long.MIN_VALUE){
append("-9223372036854775808");
return this;
}
int appendedLength = (l<0)?Long.stringSize(-l)+1
: Long.stringSize(l);
int spaceNeeded = count + appendLength;
ensureCapacityInternal(spaceNeeded);
Long.getChars(l,spaceNeeded,value);
count = spaceNeeded;
return this;
}
public AbstractStringBuilder append(float f){
FloatingDecimal.appendTo(f,this);
return this;
}
public AbstractStringBuilder append(double d){
FloatingDecimal.append(d,this);
return this;
}
//appendNull方法，因为是私有的，所以不外加说明
//其功能就是在this对象后加"null"字符
private AbstractStringBuilder appendNull(){
int c = count;
ensureCapacityInternal(c+4);
value[c++] = 'n';
value[c++] = 'u';
value[c++] = 'l';
value[c++] = 'l';
count = c ;
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