浅谈java String不可变的好处

public final class String
   implements java.io.Serializable, Comparable<String>, CharSequence {
  /** The value is used for character storage. */
  private final char value[];
 }

public final class String
  implements java.io.Serializable, Comparable<String>, CharSequence {
  /** The value is used for character storage. */
  private final byte[] value;

  /** The identifier of the encoding used to encode the bytes in   
  {@code value}. */
  private final byte coder;
}

public class Test{
  public static void main(String [] args){
   String a="abc";
   String b="abc";//对象保存在string pool中
   String c=new String("abc");//以new创建的对象保存在堆中
   System.out.println("a==b:"+(a==b));
   System.out.println("a==c:"+(a==c));
       
 } 
}