前置知識

Java在處理對象和變量時是不同的.變量傳入函數(shù)實際上是引用傳入函數(shù)內,在函數(shù)內的變量和函數(shù)外傳入的變量會使用同一個內存實例中的對象.而基本類型則是會拷貝一份相同的值,相當于方法體內的局部變量.

代碼實現(xiàn)

public class Variables {
    private int value =4;
    private String str  ="init String";

    private void initMember(){
        this.value =456;
        this.str = "qwer";
    }

    public static void main(String[] args) {
        Variables variables = new Variables();
        variables.initMember();
        System.out.println(variables.value+"---"+variables.str);
    }
}
```
輸出結果
```
456---qwer
```

####Cloneable接口的實現(xiàn)
1 clone分為影子clone和深clone,影子克隆比如在對象中包含了一個變量時,那么這個對象的clone只復制了包含的變量引用.
2 clone的實現(xiàn)需要繼承Cloneable接口,然后重寫clone()方法.

#####代碼實現(xiàn)
```
//實現(xiàn)影子clone
public class CloneA implements Cloneable {
    private int anInt;
    public Object clone(){
        CloneA cloneA =null;
        try {
            cloneA = (CloneA)super.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return cloneA;
    }
}
```
```
//實現(xiàn)深clone
public class DeepClone implements Cloneable {
    private String value;
    private CloneA cloneA;

    public Object clone() {
        DeepClone deepClone = null;
        try {
            deepClone = (DeepClone) super.clone();
          //該成員變量實現(xiàn)了Cloneable接口,進行clone
            deepClone.cloneA = (CloneA) cloneA.clone();
        } catch (CloneNotSupportedException e) {
            e.printStackTrace();
        }
        return deepClone;
    }
}
```