java.lang.String中equals方法重写

下面代码： 要求重写方法，搞了好久没搞出帮个忙

class Student extends java.lang.Object
{
private String mName;
private int mAge;
private String mSex;

public Student(String name, int age, String sex)
{
mName = name;
mAge = age;
mSex = sex;
}
public String getMName()
{
return mName;
}
public void setMName(String name)
{
mName = name;
}
public int getMAge()
{
return mAge;
}
public void setMAge(int age)
{
mAge = age;
}
public String getMSecx()
{
return mSex;
}
public void setMSecx(String secx)
{
mSex = secx;
}
public String toString()
{
return "姓名是:"+this.mName+",性别是:"+this.mSex+",年龄是:"+this.mAge;
}
public boolean equals(Object obj)
{
if()
{
return true;
}
else
{
return false;
}
}
}

public class StudentTest
{

public static void main(String[] args)
{

Student std =new Student("张三",19,"男");
Student std1 =new Student("张三",19,"男");

if(std.equals(std))
{
System.out.println("相同的对象");
}
else
{
System.out.println("不同的对象");
}
System.out.println(std);
System.out.println(std1);

}

}

public boolean equals(Object obj) {
Student obj2;
if (obj instanceof Student) {
obj2 = (Student) obj;
if (this.getMName().equals(obj2.getMName())
&& this.getMSecx().equals(obj2.getMSecx())
&& this.getMAge() == obj2.getMAge()) {
return true;
} else {
return false;
}
} else {
return false;
}

}

if(this,getname()==obj.getname()&&this.getsex==obj.getsex()&&this.getage()==obj.getage())

return true;

else return false;

建议重写Equals方法：

public boolean Equals(object obj)

{

return (obj instanceof Student) && ((Student)obj).GetMName() == this.mName && ((Student)obj).GetMAge() == this.mAge && ((Student)obj).GetMSex() == this.mSex;

}