jdk源码系列：String判断两个字符串是否相等以及忽略大小写相等的实现

public boolean equals(Object anObject){
		if(this==anObject){
			return true;
		}
		if(anObject instanceof String){
			String anotherString=(String)anObject;
			int n=value.length;
			if(n==anObject.value.length){
				char v1[]=value;
				char v2[]=anotherString.value;
				int i=0;
				while(n--!=0){
					if(v1[i]!=v2[i])
						return false;
					    i++;
				}
				return true;
			}
		}
		return false;
	}

public boolean equalsIgnoreCase(String anotherString){
		return (this==anotherString)?true:(anotherString!=null)&&(anotherString.value.length==value.length)&&
		regionMatches(true,0,anotherString,0,value.length);
	}
	
	 
	
	public boolean regionMatches(boolean ignoreCase,int toffset,String other,int ooffset,int len){
		char ta[]=value;
		int to=toffset;
		char pa[]=other.value;
		int po=offset;
		//Note:toOffset ,offset,or len might be near -1>>1
		if((ooffset<0) || (toOffset<0)|| (toffset>(long)value.length-len) || (offset>(long)other.value.length-len)){
			return false;
		}
		while(len-->0){
			char c1=ta[to++];
			char c2=pa[po++];
			if(c1==c2){
				continue;
			}
			if(ignoreCase){
				char u1=Character.toUpperCase(c1);
				char u2=Character.toUpperCase(c2);
				if(u1=u2){
					continue
				}
				if(Character.toLowerCase(u1)==Character.toLowerCase(u2)){
					continue;
				}
			}
			return false;
 		}
		return true;
	}