Java Object類

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Object類中的Method有很多，先記幾個上課學到的：

public boolean equals(Object o);//返回調用對象(this)與o對象是否相同//return o == this//通常情況是要進行覆蓋，判斷兩個對象是否是同一類型以及封裝的值是否相同public class Student{    private String sname;    private int age;    private String sno;    public boolean equals(Object o){        if(null == o) return false;        if(o.getClass() == this.getClass())        {            Student s = (Student)o;            return this.sname.equals(s.sname) &&                    this.age == s.age &&                    this.sno.equals(s.sno)        }    }}

Protected Object clone() throws CloneNotSupportedException

Protected Object clone() throws CloneNotSupportedException//return a clone of this instrance//throws CloneNotSupportedException，如果這個類不寫implements Cloneable，會拋出這個異常//這個複製是淺複製，只複製對象的屬性值，而對於引用屬性，則僅僅是複製引用//樣本public class Student implements Cloneable{   public String name;   public int age;    public static void main(String[] args) {        Student s = new Student();        s.name = "zhangsan";        s.age = 18;        try {           Student s2 = (Student) s.clone();            System.out.println(s.name);            System.out.println(s2.name);        }catch (CloneNotSupportedException r){        }    }}

public String toString()

public String toString()//returns ：a string representation of the object.//預設為 getClass().getName() + ‘@‘ + Integer.toHexString(hashCode())

protected void finalize() throws Throwable

protected void finalize()                 throws Throwable                 //在虛擬機器清理垃圾對象之前調用

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Java Object類