对象克隆

最新推荐文章于 2024-11-01 10:05:48 发布

原创最新推荐文章于 2024-11-01 10:05:48 发布 · 481 阅读

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文章标签：

#克隆 #clone #深度拷贝

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本文详细介绍了Java中使用Cloneable接口实现对象的浅拷贝与深拷贝的方法，通过具体代码实例展示了如何在不同场景下灵活运用。

Student.java

package cloneTest;

public class Student implements Cloneable{
	private String name;
	private int id;
	private Score score=new Score();

	public Student(String name,int id) {
		this.name=name;
		this.id=id;
	}
	
	@Override
	public Object clone() {
		Student stu = null;
		try{
			stu=(Student) super.clone();
		}catch(CloneNotSupportedException e){
			e.printStackTrace();
		}
		
		return stu;
	}
	
	public Object deepClone() {
		Student stu = null;
		try{
			stu=(Student) super.clone();
		}catch(CloneNotSupportedException e){
			e.printStackTrace();
			return null;
		}
		
		stu.setScore((Score) this.score.clone());
		return stu;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public Score getScore() {
		return score;
	}

	public void setScore(Score score) {
		this.score = score;
	}
}

Score.java

package cloneTest;

public class Score implements Cloneable{
	private int total;

	@Override
	public Object clone(){
		Score score = null;
		try{
			score=(Score) super.clone();
		}catch(CloneNotSupportedException e){
			e.printStackTrace();
		}
		
		return score;
	}
	
	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}
}

Test.java

package cloneTest;

public class Test {
	public static void main(String[] args) {
		Student stu = new Student("zhangsan", 1111);
		// Student stu2 = (Student) stu.clone();
		
		Student stu2 = (Student) stu.deepClone();

		stu.getScore().setTotal(111);

		stu2.setName("lisi");
		stu2.getScore().setTotal(222);

		System.out.println(stu.getName());
		System.out.println(stu2.getName());

		System.out.println(stu.getScore().getTotal());
		System.out.println(stu2.getScore().getTotal());

		System.out.println(stu == stu2);
	}

}

结果:

zhangsan
lisi
111
222
false