Java面向对象

Java面向对象

2024 年 06 月 03 日

376 次浏览

3338字数

### -- Package Entity --
<hr>
####Employee.java
```java
package Entity;

public class Employee {
	private String empId;
	private String empName;
	private String gender;
	
//	有参构造器
	public Employee(String empId, String empName, String gender) {
		this.empId = empId;
		this.empName = empName;
		this.gender = gender;
	}
//	无参构造器
	public Employee() {
		
	}
	
	
	public String getEmpId() {
		return empId;
	}
	public void setEmpId(String empId) {
		this.empId = empId;
	}
	public String getEmpName() {
		return empName;
	}
	public void setEmpName(String empName) {
		this.empName = empName;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	
	
}

```
#### Student.java
```java
package Entity;

public class Student {
	private String stdId;
	private String name;
	private int age;
	
	public String getStdId() {
		return this.stdId;
	}
	public void setStdId(String stdId) {
		this.stdId=stdId;
	}
	
	public String getName() {
		return this.name;
	}
	public void setName(String name) {
		this.name=name;
	}
	
	public int getAge() {
		return this.age;
	}
	public void setAge(int age) {
		this.age=age;
	}
	
	@Override
	public String toString() {
		return "Student [stdId=" + stdId + ", name=" + name + ", age=" + age + "]";
	}
	
}

```
<hr>
###-- Package Test -- 
<hr>
#### Test1.java
```java
package Test;

import java.util.Scanner;

import Entity.Student;

public class Test1 {
	public static void main(String[] args) {
		
		Scanner sa = new Scanner(System.in);
		System.out.println("年龄");
		int age=sa.nextInt();
		
		System.out.println("姓名");
		String name=sa.next();
		
		System.out.println("id");
		String stdId=sa.next();
		sa.close();
		Test1 t = new Test1();
		
//		声明一个Student类型的std实例
//		存储  (t.getStd 是调用Test1这个类中 t这个实例的getStd的方法)的结果(即return的 std的值)
		Student std = t.getStd(age, name, stdId);
		
		System.out.println("年龄:"+std.getAge()+"\t姓名:"+std.getName()+"\tId:"+std.getStdId());
	}
	
//	getStd方法   返回一个Student类型的值
	public Student getStd(int age,String name,String stdId) {
		Student std = new Student();
		std.setAge(age);
		std.setName(name);
		std.setStdId(stdId);
		return std;
	}
}

```

#### Test2.java
```java
package Test;

import Entity.Student;

public class Test2 {
	public static void main(String[] args) {
		Student stu1 = new Student();
		stu1.setAge(18);
		stu1.setName("hubobo");
		stu1.setStdId("2301010118");
		
		
		Student stu2 = new Student();
		stu2.setAge(20);
		stu2.setName("胡宝宝");
		stu2.setStdId("2301010119");
		System.out.println(stu1.getAge()+" "+stu1.getName()+" "+stu1.getStdId());
		System.out.println(stu2.getAge()+" "+stu2.getName()+" "+stu2.getStdId());
		
	}

}
```

####Test3
```java
package Test;

import Entity.Employee;

public class Test3 {
	public static void main(String[] args) {
//		有参构造器 在创建时进行传值
		Employee emp = new Employee("10001","Mrs.Wang","女");
		System.out.println(emp.getEmpId()+" "+emp.getEmpName()+" "+emp.getGender());
		
//		无参构造器
		Employee emp1 = new Employee();
		emp1.setEmpId("10002");
		emp1.setEmpName("Mr.Li");
		emp1.setGender("男");
		System.out.println(emp1.getEmpId()+" "+emp1.getEmpName()+" "+emp1.getGender());

}
}

```

Java面向对象