浅克隆： package testclone; public class ShallowClone implements Cloneable { public String name; public String[] name2; public ShallowClone() { name2 = new String[2]; } public Object clone() { ShallowClone o = null; try { o = (ShallowClone) super.clone(); } catch (CloneNotSupportedException e) { e.printStackTrace(); } return o; } } package testclone; public class TestShallowClone { public void changeA(ShallowClone a) { a.name = "b"; } public void changInt(int i) { i = i * 2 + 100; } public static void main(String[] args) { TestShallowClone test = new TestShallowClone(); ShallowClone a = new ShallowClone(); a.name = "a"; System.out.println("before change : a.name=" + a.name); test.changeA(a); System.out.println("after change : a.name=" + a.name); int i = 1; System.out.println("before change : i=" + i); test.changInt(i); System.out.println("after change : i=" + i); ShallowClone a1 = new ShallowClone(); ShallowClone a2 = (ShallowClone) a1.clone(); a1.name2[0] = "a"; a1.name2[1] = "1"; a2.name2[0] = "b"; a2.name2[1] = "1"; System.out.println("a1.name2=" + a1.name2); System.out.println("a1.name2=" + a1.name2[0] + a1.name2[1]); System.out.println("a2.name2=" + a2.name2); System.out.println("a2.name2=" + a2.name2[0] + a2.name2[1]); } } 输出： before change : a.name=a after change : a.name=b before change : i=1 after change : i=1 a1.name2=[Ljava.lang.String;@61de33 a1.name2=b1 a2.name2=[Ljava.lang.String;@61de33 a2.name2=b1
深克隆： package testclone; public class DeepClone implements Cloneable { public String name; public String[] name2; public DeepClone() { name2 = new String[2]; } public Object clone() { DeepClone deepClone = null; try { deepClone = (DeepClone) super.clone(); if (name != null) { deepClone.name = new String(name); } if (name2 != null) { deepClone.name2 = new String[name2.length]; for (int i = 0; i < name2.length; i++) { deepClone.name2[i] = this.name2[i]; } } } catch (CloneNotSupportedException e) { e.printStackTrace(); } return deepClone; } } package testclone; public class TestDeepClone { public void changeDeepClone(DeepClone a) { a.name = "b"; } public void changInt(int i) { i = i * 2 + 100; } public static void main(String[] args) { TestDeepClone test = new TestDeepClone(); DeepClone a = new DeepClone(); a.name = "a"; System.out.println("before change : a.name=" + a.name); test.changeDeepClone(a); System.out.println("after change : a.name=" + a.name); int i = 1; System.out.println("before change : i=" + i); test.changInt(i); System.out.println("after change : i=" + i); DeepClone a1 = new DeepClone(); DeepClone a2 = (DeepClone) a1.clone(); a1.name2[0] = "a"; a1.name2[1] = "1"; a2.name2[0] = "b"; a2.name2[1] = "1"; System.out.println("a1.name2=" + a1.name2); System.out.println("a1.name2=" + a1.name2[0] + a1.name2[1]); System.out.println("a2.name2=" + a2.name2); System.out.println("a2.name2=" + a2.name2[0] + a2.name2[1]); } } 输出： before change : a.name=a after change : a.name=b before change : i=1 after change : i=1 a1.name2=[Ljava.lang.String;@61de33 a1.name2=a1 a2.name2=[Ljava.lang.String;@14318bb a2.name2=b1
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