JAVA 初始化数据域的三种方法

1.在构造器中设置初始化值；

public class Student{     private String name;     private int age;     public Student(){           this.name = "张梅";           this.age = 15;    }}

2.在声明中赋值；

public class Student{     private String name = "张梅";    private int age = 15;}

3.在初始化块中赋值。

public class Student{     private String name;     private int age;     {           this.name = "张梅";           this.age = 15;     }}