Java基础：深入 JAVA对象的复制与比较
<p >1.对象的复制<p >2.clone()的使用<p >3.对象实例的比较<p >///////////////////////////////////////////<p ><p >1.对象的复制<p ><p >String str1 = "This is a string!"//这里是 "对象引用" 的复制 <p >String str2 = new String(str1);//这里是 "对象实例" 的复制 <p ><p >浅复制: 只复制复合对象本身.<p >深复制: 除了复制复合对象本身, 还复制了复合对象的引用的对象实例.<p ><p >例如: <p ><p >class Pupil{ <p > public Pupil(String sno, String name, int age){ <p > this.sno = new String(sno); <p > this.name = new String(name); <p > this.age = age; <p > } <p ><p > public String getSno() { <p > return sno; <p > } <p ><p > public String getName() { <p > return name; <p > } <p ><p > public int getAge() { <p > return age; <p > } <p ><p > public void setAge(int age) { <p > this.age = age; <p > } <p ><p > private String sno; <p > private String name; <p > private int age; <p >} <p ><p >public class CopyDemo { <p > public static Pupil[] shallowCopy(Pupil[] aClass) { <p > Pupil[] newClass = new Pupil; <p ><p > //此时newClass 与aClass 指向同一块内存 <p > for(int i=0; i <p > newClass = aClass; <p > return newClass; <p > } <p ><p > public static Pupil[] deepCopy(Pupil[] aClass) { <p > Pupil[] newClass = new Pupil; <p ><p > //此时newClass 与aClass 的相应sno , name 指向同一块内存 <p > for(int i=0; i <p > String sno = aClass.getSno(); <p > String name = aClass.getName(); <p > int age = aClass.getAge(); <p > newClass = new Pupil(sno, name, age); <p > } <p ><p > return newClass; <p > } <p ><p > public static Pupil[] deeperCopy(Pupil[] aClass) { <p > Pupil[] newClass = new Pupil; <p ><p > //完全的复制 <p > for(int i=0; i <p > String sno = new String(aClass.getSno()); <p > String name = new String(aClass.getName()); <p > int age = aClass.getAge(); <p > newClass = new Pupil(sno, name, age); <p > } <p ><p > return newClass; <p > } <p >} <p align="center"><font color="FF0000" >1</font>2<span class="content01">下一页>></span></p></p>
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