Java实现数据共享的三种方式

Java实现数据共享的三种方式

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目录

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内容

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1、类的静态变量

• 示例：老师和学生共用一间教室

• Classroom类代码1-1：教室类

    package innerclass;
  
    public class Classroom {
    	private String no;
  
    	public Classroom(String no) {
    		super();
    		this.no = no;
    	}
  
    	public String getNo() {
    		return no;
    	}
  
    	public void setNo(String no) {
    		this.no = no;
    	}
  
    	@Override
    	public String toString() {
    		return this.no + "号教室";
    	}
    }
  

• Teacher类代码1-2：老师类

    package innerclass;
  
    public class Teacher {
    	private String name;
    	private Student stu;
    	public Teacher(String name) {
    		super();
    		this.name = name;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    }
  

• Student类代码1-3：学生类

    package innerclass;
  
    public class Student {
    	private String name;
    	private Teacher teacher;
  
    	public Student(String name) {
    		super();
    		this.name = name;
    	}
  
  
    	public String getName() {
    		return name;
    	}
  
  
    	public void setName(String name) {
    		this.name = name;
    	}
    }
  

• Test2类代码1-4：测试类

    package innerclass;
  
    public class Test2 {
  
    	static Classroom room = new Classroom("002");
  
    	public static void main(String[] args) {
    		Teacher t = new Teacher("高老师");
    		Student s = new Student("小飞");
  
    		System.out.println(t.getName() + "在" + Test2.room + "教课");
    		System.out.println(s.getName() + "在" + Test2.room + "上课");
    	}
    }
  

• 测试结果：

    高老师在002号教室教课
    小飞在002号教室上课
  

• 解析：类的静态成员在内存中只有1个

2、类内声明共享数据类型的引用

• 示例：一名老师负责指导一名学生

• Teacher类代码2-1：老师类

    package innerclass;
  
    public class Teacher {
    	private String name;
    	private Student stu;
    	public Teacher(String name) {
    		super();
    		this.name = name;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
  
    	public void setStu(Student stu) {
    		this.stu = stu;
    	}
    	@Override
    	public String toString() {
    		return this.name;
    	}
  
    	public void teacher() {
    		System.out.println(this.name + "指导" + this.stu.getName() + "同学");
    	}
    }
  

• Student类代码2-2：学生类

    package innerclass;
  
    public class Student {
    	private String name;
    	private Teacher teacher;
  
    	public Student(String name) {
    		super();
    		this.name = name;
    	}
  
  
    	public String getName() {
    		return name;
    	}
  
  
    	public void setName(String name) {
    		this.name = name;
    	}
  
  
    	public void setTeacher(Teacher teacher) {
    		this.teacher = teacher;
    	}
  
  
    	@Override
    	public String toString() {
    		return this.name;
    	}
  
    	public void study() {
    		System.out.println(this.name + "同学"+ "由" + this.teacher.getName() + "指导");
    	}
    }
  

• Test1类代码2-3：测试类

    package innerclass;
  
    public class Test1 {
    	public static void main(String[] args) {
    		Teacher t = new Teacher("王老师");
    		Student stu = new Student("小明");
  
    		t.setStu(stu);
    		stu.setTeacher(t);
  
    		t.teacher();
    		stu.study();
    	}
    }
  

• 测试结果：

    王老师指导小明同学
    小明同学由王老师指导
  

3、内部类

• 示例：同上

• 代码3-1：

    package innerclass;
  
    public class Test3 {
    	public static void main(String[] args) {
    		Classroom1 room = new Classroom1("003");
    		Classroom1.Teacher t = room.new Teacher("李老师");
    		Classroom1.Student s = room.new Student("小田");
  
    		t.display();
    		s.display();
    	}
    }
  
    class Classroom1 {
    	private String no;
  
    	class Teacher {
    		private String name;
    		public Teacher(String name) {
    			super();
    			this.name = name;
    		}
    		public String getName() {
    			return name;
    		}
    		public void setName(String name) {
    			this.name = name;
    		}
  
    		public void display() {
    			System.out.println(this.name + "在" + no + "号教室" + "教课");
    		}
    	}
  
    	class Student {
    		private String name;
  
    		public Student(String name) {
    			super();
    			this.name = name;
    		}
  
  
    		public String getName() {
    			return name;
    		}
  
  
    		public void setName(String name) {
    			this.name = name;
    		}
  
    		public void display() {
    			System.out.println(this.name + "在" + no + "号教室" + "上课");
    		}
    	}
    	public Classroom1(String no) {
    		super();
    		this.no = no;
    	}
  
    	public String getNo() {
    		return no;
    	}
  
    	public void setNo(String no) {
    		this.no = no;
    	}
    }
  

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