Java Clone(类的复制)实例代码

自己实现了一遍：

public class a implements cloneable {
public string str[];

a() {
str = new string[2];
}

public object clone() {
a o = null;
try {
o = (a) super.clone();
} catch (clonenotsupportedexception e) {
e.printstacktrace();
}
o.str = new string[2];
return o;
}
}

void run() throws exception {
a a1 = new a(), a2 = new a();
a1.str[0] = "a"; a1.str[1] = "b";
a2 = (a) a1.clone();
a2.str[0] = "c"; a2.str[1] = "d";
system.out.println(a1.str[0] + " " + a2.str[0]);
}

结果：

a c

1.

public class a implements cloneable {
 public string name;

 public object clone() {
  a o = null;
  try {
   o = (a) super.clone();
  } catch (clonenotsupportedexception e) {
   e.printstacktrace();
  }
  return o;
 }
}

2.

public class a implements cloneable {
 public string name[];

 public a(){
  name=new string[2];
 }

 public object clone() {
  a o = null;
  try {
   o = (a) super.clone();
  } catch (clonenotsupportedexception e) {
   e.printstacktrace();
  }
  return o;
 }
}

3.

public class a implements cloneable {   
     public string name[];   
     public vector<b> clab;   

     public a(){   
         name=new string[2];   
         clab=new vector<b>();   
     }   

     public object clone() {   
         a o = null;   
         try {   
             o = (a) super.clone();   
         } catch (clonenotsupportedexception e) {   
             e.printstacktrace();   
         }   
         o.name=new string[2];//深度clone   
         o.clab=new vector<b>();//将clone进行到底   
         for(int i=0;i<clab.size();i++){   
             b temp=(b)clab.get(i).clone();//当然class b也要实现相应clone方法
             o.clab.add(temp);   
         }   
         return o;   
     }   
 }