本文主要介绍了面向对象的三大特征实例解析，下面看看具体内容。

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封装

封装一个Teacher和Student类

package com.hz.test;
public class Teacher {
  private String name;
  private String majorDirection;
  private String teachCourse;
  private int teachAge;
  public Teacher() {
    super();
  }
  public Teacher(String name,String majorDirection,String teachCourse,int teachAge) {
    this.name = name;
    this.majorDirection = majorDirection;
    this.teachCourse = teachCourse;
    this.teachAge = teachAge;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getMajorDirection() {
    return majorDirection;
  }
  public void setMajorDirection(String majorDirection) {
    this.majorDirection = majorDirection;
  }
  public String getTeachCourse() {
    return teachCourse;
  }
  public void setTeachCourse(String teachCourse) {
    this.teachCourse = teachCourse;
  }
  public int getTeachAge() {
    return teachAge;
  }
  public void setTeachAge(int teachAge) {
    this.teachAge = teachAge;
  }

  public String toString() {
    return "姓名=" + getName() + ", 专业方向=" + getMajorDirection()
        + ", 所教课程=" + getTeachCourse() + ", 教龄=" + getTeachAge();
  }
}

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