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JAVA 面向对象( 类和对象)

2015-08-20 10:14 435 查看
基本概念:

     面向对象是一种新兴的程序设计方法,或者是一种新的程序设计规范(paradigm),其基本思想是使用对象、类、继承、封装、消息等基本概念来进行程序设计。

例题:

<pre>

1个班有4个小组,每个小组有3学生

要求:

1)输入班级名,能查询到其下的所有小组名及每个小组的学生信息,展示如下:

你查询的班级名为"LOL":

|—— 第一组,输出组

|——剑圣

|—— 剑姬

    |—— 剑豪

   |—— 第二组,辅助组

|—— 狗头

|—— 牛头

    |—— 石头

  |—— 第三组,中单组

|—— 卡特

|—— 卡牌

    |—— 安妮

   |—— 第四组,ADC组

 |—— 小炮

   |—— 女警

     |—— 薇恩

2)输入指定小组名,能查询到其下的所有学生信息

你查询的小组名为"ADC组":

|—— 小炮

|—— 女警

   |—— 薇恩

3)输入指定学生名,能查询到器所属的小组信息机班级信息!

你查询的小组名为"薇恩":所在小组为“ADC组”,所在班级为“LOL”!

</pre>

 思路:首先找出三个类模型:班级、小组、学生

    其次 写一个主调方法类

班级类

public class Class {

public String name ;

public Group[] groups;

public void queryTeamAndStudentInfo() {

for (Group group : groups) {

System.out.println("|—— " + group.name);

for (Student student : group.students) {

System.out.println("\t|—— " + student.name);

}

}

}

public void queryStudentInfo(String studentName) {

boolean flag = false;

Group belongTeam = null;

for (Group team : groups) {

for (Student student : team.students) {

if (student.name.equals(studentName)) {

flag = true;

belongTeam = team;

break;

}

}

}

if (flag) {

System.out.println("你查询的学生名为“" + studentName + "”:所在小组为“" + belongTeam.name + "”,所在班级为“" + name + "”!");

} else {

System.out.println("你查询的学生不存在!");

}

}

}

小组类

public class Group {

public String name ;

public Student[] students;

public void queryStudentInfo() {

for (Student student : students) {

System.out.println("|—— " + student.name);

}

}

}

学生类

public class Student {

public String name ;

}

主调用方法类:

public class Main {

public Class initData(){

Student student1 = new Student();

student1.name = "剑圣";

Student student2 = new Student();

student2.name = "剑姬";

Student student3 = new Student();

student3.name = "剑豪";

Student student4 = new Student();

student4.name = "狗头";

Student student5 = new Student();

student5.name = "石头";

Student student6 = new Student();

student6.name = "牛头";

Student student7 = new Student();

student7.name = "卡牌";

Student student8 = new Student();

student8.name = "安妮";

Student student9 = new Student();

student9.name = "卡特";

Student student10 = new Student();

student10.name = "小炮";

Student student11 = new Student();

student11.name = "女警";

Student student12 = new Student();

student12.name = "薇恩";

Group group1 = new Group();

group1.name ="输出组";

group1.students = new Student[] { student1, student2,student3 };

Group group2 = new Group();

group2.name = "辅助组";

group2.students = new Student[] { student4, student5,student6 };

Group group3 = new Group();

group3.name = "中单组";

group3.students = new Student[] { student7, student8,student9 };

Group group4 = new Group();

group4.name = "ADC组";

group4.students = new Student[] { student10, student11,student12 };

Class myClass = new Class();

myClass.name = "LOL";

myClass.groups = new Group[] { group1, group2, group3, group4 };

return myClass;

}

public static void main(String[] args) {

Class myClass = new Main().initData();

// myClass.queryTeamAndStudentInfo();

// Group group = myClass.teams[0];

// group.queryStudentInfo();

myClass.queryStudentInfo("薇恩");

}

}
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