java中的克隆方法的使用(三类 浅、深、完美克隆 ) 博客分类： java java克隆

package clone;                           //本例子阐释了clone的魅力，影子克隆
class UnCloneA { 
	private int i; 
	public UnCloneA(int ii) {
		i = ii; 
		} 
	public void doublevalue() {
		i *= 2; 
		} 
	public String toString() { 
		return Integer.toString(i);      //把整数转换为字符串
		} 
	} 

class CloneB implements Cloneable{     //实现了克隆接口 Cloneable
	public int aInt;
	public UnCloneAA unCA = new UnCloneAA(111);
	
	public Object clone(){                         //重写clone方法
		CloneB o = null; 
		try{
			o = (CloneB)super.clone(); 
			}catch(CloneNotSupportedException e){
				e.printStackTrace(); 
				} 
		return o; 
		}
	} 
public class CloneMain影子克隆 {
	public static void main(String[] a){
		CloneB b1 = new CloneB(); 
		b1.aInt = 11; 
		System.out.println("before clone,b1.aInt = "+ b1.aInt); 
		System.out.println("before clone,b1.unCA = "+ b1.unCA); 
		CloneB b2 = (CloneB)b1.clone();                         //b1的克隆
		b2.aInt = 22;           
		b2.unCA.doublevalue(); 
		System.out.println("================================="); 
		System.out.println("after clone,b1.aInt = "+ b1.aInt); 
		System.out.println("after clone,b1.unCA = "+ b1.unCA);      //已经被改变了
		System.out.println("================================="); 
		System.out.println("after clone,b2.aInt = "+ b2.aInt); 
		System.out.println("after clone,b2.unCA = "+ b2.unCA); 
	}
}

/** RUN RESULT:
 *  before clone,b1.aInt = 11 before clone,b1.unCA = 111 
 *  ================================= 
 *  after clone,b1.aInt = 11 after clone,b1.unCA = 222 
 * ================================= 
 * after clone,b2.aInt = 22 after clone,b2.unCA = 222 */
 

package clone;

class UnCloneAA implements Cloneable{ 
	private int i; 
	public UnCloneAA(int ii) {
		i = ii; 
		} 
	public void doublevalue() { 
		i *= 2; 
		} 
	public String toString() {
		return Integer.toString(i);
		} 
	public Object clone(){                        //深度克隆这个类也要重写这个方法
		UnCloneAA o = null;
		try{ 
			o = (UnCloneAA)super.clone();
			}catch(CloneNotSupportedException e){
				e.printStackTrace(); 
				} 
		return o; 
		} 
	} 
class CloneBB implements Cloneable{ 
	public int aInt; 
	public UnCloneAA unCAA = new UnCloneAA(111); 
	public Object clone(){                         
		CloneBB o = null; 
	try{ 
		o = (CloneBB)super.clone(); 
		}catch(CloneNotSupportedException e){ 
			e.printStackTrace(); 
			} 
	o.unCAA = (UnCloneAA)unCAA.clone();              //深度克隆必加的一句
	return o; 
	} 
	} 
public class CloneMain深度克隆 {
	public static void main(String[] a){ 
		CloneBB b1 = new CloneBB(); 
		b1.aInt = 11; 
		System.out.println("before clone,b1.aInt = "+ b1.aInt); 
		System.out.println("before clone,b1.unCA = "+ b1.unCAA); 
		CloneBB b2 = (CloneBB)b1.clone();                             //克隆
		b2.aInt = 22;
		b2.unCAA.doublevalue(); 
		System.out.println("================================="); 
		System.out.println("after clone,b1.aInt = "+ b1.aInt); 
		System.out.println("after clone,b1.unCA = "+ b1.unCAA); 
		System.out.println("================================="); 
		System.out.println("after clone,b2.aInt = "+ b2.aInt); 
		System.out.println("after clone,b2.unCA = "+ b2.unCAA); 
}
	}
/*before clone,b1.aInt = 11
before clone,b1.unCA = 111
=================================
after clone,b1.aInt = 11
after clone,b1.unCA = 111
=================================
after clone,b2.aInt = 22
after clone,b2.unCA = 222
*/


package clone;

class UnCloneAAA implements Cloneable{ 
	private int i; 
	public UnCloneAAA(int ii) { 
		i = ii; 
		} 
	public void doublevalue() { 
		i *= 2; 
		} 
	public String toString() { 
		return Integer.toString(i);
		} 
	public Object clone(){ 
		UnCloneAAA o = null;
		try{ 
			o = (UnCloneAAA)super.clone();
		}catch(CloneNotSupportedException e){ 
			e.printStackTrace(); 
			} 
		return o; 
		} 
	} 
class CloneBBB implements Cloneable{ 
	public int aInt; 
	public UnCloneAAA unCAAA = new UnCloneAAA(111); 
	public Object clone(){
		CloneBBB o = null; 
		try{
			o = (CloneBBB)super.clone();
			}catch(CloneNotSupportedException e){ 
				e.printStackTrace(); 
				} 
		o.unCAAA = (UnCloneAAA)unCAAA.clone(); 
		return o; 
		} 
	} 
public class CloneMain完美克隆 { 
	public static void main(String[] a){ 
		CloneBBB b1 = new CloneBBB(); 
		b1.aInt = 11; 
		System.out.println("before clone,b1.aInt = "+ b1.aInt);
		System.out.println("before clone,b1.unCA = "+ b1.unCAAA); 
		CloneBBB b2 = (CloneBBB)b1.clone();
		b2.aInt = 22; 
		b2.unCAAA.doublevalue(); 
		System.out.println("================================="); 
		System.out.println("after clone,b1.aInt = "+ b1.aInt); 
		System.out.println("after clone,b1.unCA = "+ b1.unCAAA); 
		System.out.println("================================="); 
		System.out.println("after clone,b2.aInt = "+ b2.aInt); 
		System.out.println("after clone,b2.unCA = "+ b2.unCAAA); 
	} 
}
/*before clone,b1.aInt = 11
before clone,b1.unCA = 111
=================================
after clone,b1.aInt = 11
after clone,b1.unCA = 111
=================================
after clone,b2.aInt = 22
after clone,b2.unCA = 222
*/