如何在Java中调用另一个类中的方法？

Question

目前我有两节课.课堂班和学校班.我想在School类中编写一个方法来从教室类调用public void setTeacherName(String newTeacherName).

classroom.java

public class classroom {
    private String classRoomName;
    private String teacherName;

    public void setClassRoomName(String newClassRoomName) {
        classRoomName = newClassRoomName;

    }

    public String returnClassRoomName() {
        return classRoomName;
    }

    public void setTeacherName(String newTeacherName) {
        teacherName = newTeacherName;

    }

    public String returnTeacherName() {
        return teacherName;
    }
}

School.java

import java.util.ArrayList;

public class School {
    private ArrayList<classroom> classrooms;
    private String classRoomName;
    private String teacherName;

    public School() {
        classrooms = new ArrayList<classroom>();
    }

    public void addClassRoom(classroom newClassRoom, String theClassRoomName) {
        classrooms.add(newClassRoom);
        classRoomName = theClassRoomName;
    }

    // how to write a method to add a teacher to the classroom by using the
    // classroom parameter
    // and the teachers name
}  

Answer 1

您应该将类​​的名称大写.在你的学校课堂上这样做之后,

Classroom cls = new Classroom();
cls.setTeacherName(newTeacherName);

此外,我建议您使用某种IDE,例如eclipse,它可以帮助您使用代码为您生成getter和setter.例如:右键单击Source - > Generate getters and setters

Answer 2

试试这个 :

public void addTeacherToClassRoom(classroom myClassRoom, String TeacherName)
{
    myClassRoom.setTeacherName(TeacherName);
}

Answer 3

class A{
  public void methodA(){
    new B().methodB();
    //or
    B.methodB1();
  }
}

class B{
  //instance method
  public void methodB(){
  }
  //static method
  public static  void methodB1(){
  }
}

Answer 4

在学校，

public void addTeacherName(classroom classroom, String teacherName) {
    classroom.setTeacherName(teacherName);
}

顺便说一句，使用 Pascal Case 作为类名。另外，我建议将Map<String, classroom>教室名称映射到教室。

然后，如果您使用我的建议，这将起作用

public void addTeacherName(String className, String teacherName) {
    classrooms.get(className).setTeacherName(teacherName);
}