十四章 1.方法定义 public 返回值类型 方法名(参数类型1 参数名1,参数类型2 参数名2···){ //方法体 } 2.有参数的调用 a.如果同一个类中,方法可以直接调用。 b.如果是不同的类,方法必须通过对象调用, 对象名,方法名(实参1,实参2···); 注意:1.实参的数据类型,参数的个数,参数的顺序要与形参保持一致 2.调用返回值的方法,一般要接收返回值,并作出相应的处理。 public class Excelle { private String type; private String id; public Excelle(){ } public Excelle(String type,String id ){ this.type = type; this.id = id; } public String getType(){ return type; } public String getId(){ return id; } } public class Excelle { public static void main(String[] args){ Seller sl = new Seller(); Excelle car = new Excelle("abc","1"); sl.sell(car); Regal rl = new Regal("bbb","2"); sl.sell(rl); Excelle ec = new Excelle("ccc","3"); sl.sell(ex,5); } } public class Student { String name; int age; String sex; String subject; public Student(){ } public Student(String name,int age,String sex,String subject){ this.name = name; this.age = age; this.sex = sex; this.subject = subject; } public String getName(){ return name; } public int getAge(){ return age; } public String getSex(){ return sex; } public String getSubject(){ return subject; } public void wj(){ System.out.println("我是"+this.name+"年龄"+this.age+"性别"+this.sex+"专业"+this.subject); } } public class Student{ public static void main(String[] args){ Student s = new Student("xy",18,"nan","aaa"); s.getAge(); s.getName(); s.getSex(); s.getSubject(); s.wj(); } }