Java Clone(類別的複製)實例程式碼

自己實現了一遍：

複製代碼代碼如下:

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]);
}

結果：

ac

1.

複製代碼代碼如下:

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.

複製代碼代碼如下:

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.

複製代碼代碼如下:

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>();//將clone進行到底
for(int i=0;i<claB.size();i++){
B temp=(B)claB.get(i).clone();//當然Class B也要實作對應clone方法
o.claB.add(temp);
}
return o;
}
}