本文目录一览：
- 1、用JAVA （1）定义一个Teacher类，为其添加编号（String）、姓名、年龄3个变量和一个无参构造方法
- 2、求Java高手： 写程序！
- 3、一道java编程题 急！！！
- 4、JAVA高手，请修改代码TestTeacher.java，把p1、p2、s1、s2、s3、t1打印出来。。
用JAVA （1）定义一个Teacher类，为其添加编号（String）、姓名、年龄3个变量和一个无参构造方法
完整代码
public class Teacher {
private String number;
private String name;
private int age;
public Teacher(){
//Java 默认初始化
}
public Teacher(String number,String name,int age){
this.number = number;
this.name = name;
this.age = age;
}
public static void main(String[] args) {
Teacher teacher = new Teacher();
System.out.println("Default teacher number: " + teacher.number);
System.out.println("Default teacher name: " + teacher.name);
System.out.println("Default teacher age: " + teacher.age);
Teacher teacher2 = new Teacher("001", "Miss Gao", 25);
System.out.println("Constructor by Teacher(String number,String name,int age) teacher number: " + teacher2.number);
System.out.println("Constructor by Teacher(String number,String name,int age) teacher name: " + teacher2.name);
System.out.println("Constructor by Teacher(String number,String name,int age) teacher age: " + teacher2.age);
}
}
---------------运行结果
Default teacher number: null
Default teacher name: null
Default teacher age: 0
Constructor by Teacher(String number,String name,int age) teacher number: 001
Constructor by Teacher(String number,String name,int age) teacher name: Miss Gao
Constructor by Teacher(String number,String name,int age) teacher age: 25
求Java高手： 写程序！
给你写的例子 你可以仿照写Director类 ，Director是 extends Teacher implements IPerson ，你可以练习下
IPerson接口：
--------------------------------------
package com.demo;
/**
* p
* Description: 接口
* /p
*
*/
public interface IPerson {
public void print();
}
------------------------------------------------------
Teacher类：
package com.demo;
/**
* p
* Description:老师类
* /p
*/
public class Teacher implements IPerson {
private String ID;//工号ID，
private String name;//姓名name，
private double salary;//工资salary，
private String job;//职务job；
public void Tesacher() {
}
public Teacher(String ID, double salary, String job) {
this.ID = ID;
this.salary = salary;
this.job = job;
}
public Teacher(String ID, String name, double salary, String job) {
this.ID = ID;
this.name = name;
this.salary = salary;
this.job = job;
}
/**
* @return the iD
*/
public String getID() {
return ID;
}
/**
* @param iD the iD to set
*/
public void setID(String iD) {
ID = iD;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the salary
*/
public double getSalary() {
return salary;
}
/**
* @param salary the salary to set
*/
public void setSalary(double salary) {
this.salary = salary;
}
/**
* @return the job
*/
public String getJob() {
return job;
}
/**
* @param job the job to set
*/
public void setJob(String job) {
this.job = job;
}
/* (non-Javadoc)
* @see com.demo.IPerson#print()
*/
public void print() {
System.out.println("老师工号：" + getID());
System.out.println("老师姓名：" + getName());
System.out.println("老师职务：" + getJob());
System.out.println("老师工资：" + getSalary());
}
}
-----------------------------------------------------
Test类：
package com.demo;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
IPerson teacher = new Teacher("1", "张三丰", 20000, "太极");
teacher.print();
}
}
一道java编程题 急！！！
public class Test {
public static void main(String args[]) {
Teacher t1 = new Teacher("001","张三","23","40");
Teacher t2 = new Teacher("002","李四","45","102");
Teacher t3 = new Teacher("003","王五","34","80");
Teacher t4 = new Teacher("004","赵六","19","15");
Teacher t5 = new Teacher("005","前期","24","50");
List list = new ArrayList();
list.add(t1);
list.add(t2);
list.add(t3);
list.add(t4);
list.add(t5);
Object[] techers = list.toArray();
System.out.println ("排序前。。。。");
for (int i = 0; iteachers.length; i++){
System.out.println (teachers[i]);
}
//调用排序方法
java.util.Arrays.sort(teachers, new MyComparator());
System.out.println ("排序后。。。。");
for (int i = 0; iteachers.length; i++){
System.out.println (teachers[i]);
}
}
}
class Teacher {
private String no;
private String name;
private int age;
private int count;
public Teacher(String no, String name, int age, int count) {
this.no = no;
this.name = name;
this.age = age;
this.count =count;
}
public void setNo(String no){
this.no = no;
}
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
public void setCount(int count) {
this.count = count;
}
public String getNo() {
return this.no;
}
public String getName() {
return this.name;
}
public int getAge() {
return this.age;
}
public int getCount() {
return this.count;
}
}
class MyComparator implements Comparator {
public int compare(Object o1, Object o2) {
Teacher t1 = (Teacher) o1;
Teacher t2 = (Teacher) o2;
if(t1.getCount() t2.getCount())
return 1;
else if(t1.getCount() t2.getCount())
return -1;
else {
//论文数量相同，按年龄排序
if(t1.getAge() t2.getAge()) {
return 1;
} else if(t1.getAge() t2.getAge()) {
return -1;
} else {
//利用String自身的排序方法。按名字排序
return t1.getName().compareTo(t2.getName());
}
}
}
}
JAVA高手，请修改代码TestTeacher.java，把p1、p2、s1、s2、s3、t1打印出来。。
代码已经改好，给你说说问题所在：
Person作为父类，没有提供空参数构造器，导致子类在没有显示调用父类有参构造器报错，所以父类提供了一个无惨构造器，
后面的
s3.name = "刘七";
s3.location = "儋州";
s3.school = "海南大学";
这三句出错，原因就是name等属性在类中设置为private，私有的，所有不能直接赋值给他，所有我在类中提供了set、get方法。一下程序是我改后的，直接可以运行
class Person {
private String name;
private String location;
Person(){}
Person(String name) {
this.name = name;
location = "三亚";
}
Person(String name,String location) {
this.name = name;
this.location = "三亚";
}
public String info() {
return "姓名: "+name+" 地址: "+location;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
class Teacher extends Person {
private String capital;
Teacher(String name, String capital) {
this(name, "三亚", capital);
}
Teacher(String n, String l, String capital) {
super(n,l);
this.capital = capital;
}
public String info() {
return super.info()+" " + "职称：" + capital;
}
}
class Student extends Person {
private String school;
Student(){}
Student(String name,String school) {
this(name,"三亚", school);
}
Student(String n,String l,String school) {
super(n,l);
this.school = school;
}
public String info() {
return super.info()+" " + "学校名称:"+school;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
}
public class Tteacher {
public static void main(String[] args) {
Person p1 = new Person("张三");
Person p2 = new Person("李四","三亚");
Student s1 = new Student("王五","琼州学院电子信息工程学院");
Student s2 = new Student("赵六","海口","海南大学");
Student s3 = new Student();
// s3.name = "刘七";
s3.setName("刘七");
//s3.location = ;
s3.setLocation("儋州");
// s3.school = "海南大学";
s3.setSchool("海南大学");
Teacher t1 = new Teacher("崔二", "教授");
//以下六句不可修改且为必须要实现的部分，每句十分。
System.out.println(p1.info());
System.out.println(p2.info());
System.out.println(s1.info());
System.out.println(s2.info());
System.out.println(s3.info());
System.out.println(t1.info());
}
}