Java实现数据共享的三种方式

2021-09-14 00:00:00 方式 共享 三种

Java实现数据共享的三种方式

目录

文章目录

  • 1、类的静态变量
  • 2、类内声明共享数据类型的引用
  • 3、内部类
    • ***后记*** :
内容

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;
      	}
      }
    

后记

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    原文作者:gaog2zh
    原文地址: https://blog.csdn.net/gaogzhen/article/details/106796445
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