String源码
public final class String implements java.io.Serializable,Comparable<String> CharSequence{
private final char value[];//维护了一个字符数组
private final int offset;//记录开始
private final int count;//字符的个数
private int hash;
}
compareTo
public int compareTo(String paramString)
{
int i = this.value.length;
int j =paramString.length;
int k =Math.min(i,j);
char[] arrayOfChar1 = this.value;
char[] arrayOfChar2 = paramString.value;
for(int m = 0;m<k;m++){
int n =arrayOfChar1.length;
int i1 = arrayOdChar2 ,length;
if(n !=i1)
return n-i1;
}
return i-j
}
indexOf
equals
public boolean equals(Object paramObject)
{
if(this == paramObject){
return true;
}
if(paramObject instanceof String)
{
String str =(String) paramObject;
int i = this.value.length;
if( i == str.value.length){
char[] arrayOfChar1 = this.value;
char[] arrayOfChar2 = str.value;
for(int j = 0;i-- !=0;j++)
if(arrayOfChar1[j] !=arrayOfChar2[j])
return false;
return true;
}
}
return false;
}
getBytes
split*****以及自己如何实现一个split方法，利用反射
substring
StringBuffer 和 StringBulider 共同父类AbstractStringBulider StringBuffer是线程安全的里面的方法是synchronized
append insert