版权声明:进击的葱 https://blog.csdn.net/qlwangcong518/article/details/77054095
package T1;
public class t1_1 {
// 1)设计显示各种水果的定购详情的类,详情包括:名称、数量、价格
// 测试数据:"苹果", 10, 20 ; "芒果", 18, 56 ; "桔子", 25, 75
private String name;
private double num;
private double price;
public t1_1(String name, double num, double price) {
super();
this.name = name;
this.num = num;
this.price = price;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the num
*/
public double getNum() {
return num;
}
/**
* @param num the num to set
*/
public void setNum(double num) {
this.num = num;
}
/**
* @return the price
*/
public double getPrice() {
return price;
}
/**
* @param price the price to set
*/
public void setPrice(double price) {
this.price = price;
}
public void display() {
System.out.println(getName()+","+getNum()+","+getPrice());
}
public static void main(String[] args) {
t1_1 t1 = new t1_1("苹果", 10, 10);
t1_1 t2 = new t1_1("芒果", 18, 56);
t1_1 t3 = new t1_1("橘子", 25, 75);
t1.display();
t2.display();
t3.display();
}
}
package T1;
public class t1_2 {
// 2)设计一个类用于得出三个不同盒子的体积。
// 测试数据:2, 3, 4 ;1, 5, 6 ;3, 8, 2
private double a;
private double b;
private double c;
public t1_2(double a, double b, double c) {
super();
this.a = a;
this.b = b;
this.c = c;
}
/**
* @return the a
*/
public double getA() {
return a;
}
/**
* @param a the a to set
*/
public void setA(double a) {
this.a = a;
}
/**
* @return the b
*/
public double getB() {
return b;
}
/**
* @param b the b to set
*/
public void setB(double b) {
this.b = b;
}
/**
* @return the c
*/
public double getC() {
return c;
}
/**
* @param c the c to set
*/
public void setC(double c) {
this.c = c;
}
public void display() {
System.out.println(getA()+" "+getB()+" "+getC()+" "+getA()*getB()*getC());
}
public static void main(String[] args) {
t1_2 t1 = new t1_2(2, 3, 4);
t1_2 t2 = new t1_2(1, 5, 6);
t1_2 t3 = new t1_2(3, 8, 2);
t1.display();
t2.display();
t3.display();
}
}
package T1;
public class t1_3 {
// 3)设计一个Tools类提供重载方法println()和println(String info),
// 让其接收不同的数据并能打印字符串,数字,布尔值和换行打印。
public void println(int a) {
System.out.println("int = "+a);
}
public void println(String info) {
System.out.println("string = info");
}
public static void main(String[] args) {
t1_3 t = new t1_3();
t.println(3);
t.println("SkyCong王聪");
}
}
package T1;
public class t1_4 {
// 4)设计用于将华氏温度转换为摄氏温度的类.
// 提示:
// 华氏温度转换为摄氏温度.公式 摄氏=(华氏-32)*5/9
// 摄氏温度转换为华氏温度.公式 华氏=摄氏*9/5+32
private double fah;
private double deg;
public t1_4(double fah) {
super();
this.fah = fah;
}
public void zh_deg() {
deg = (fah-32)*5/9;
System.out.println(deg);
}
public static void main(String[] args) {
t1_4 t = new t1_4(10); //华氏温度10度
t.zh_deg();
}
/**
* @return the fah
*/
public double getfah() {
return fah;
}
/**
* @param fah the fah to set
*/
public void setfah(double fah) {
this.fah = fah;
}
}
package T1;
public class t1_5 {
//4)设计一个测试
//类,仅有一个main方法,然后在main中设定一个华氏温度,
//然后调用上题定义的方法转换成摄氏温度,最后使用6中的
//Tools类的print完成打印输出
public static void main(String[] args) {
t1_4 t1_5 = new t1_4(1);
t1_5.setfah(2);
t1_5.zh_deg();
}
}
package T1;
public class t1_6 {
/**
* 6).写一个名叫Person的类表示人类,
* 数据域为姓名name、性别gender、年龄age,name是String类型、
* gender是boolean类型(true表示男性,false表示女性)、age是int类型;
* 人的行为有行走walk、吃eat。要求如下:
* a)实现walk和eat方法,分别打印“XXX在行走”,“XXX在吃东西”;XXX是具体人名
* b)提供main方法,创造两个人类的实例:Lucy,女,23岁;Jame,男,25岁
* c)在main方法中分别调用两个人类实例的walk和eat方法,观察打印结果
*/
private String name;
private boolean gender;
private int age;
public t1_6(String name, boolean gender, int age) {
super();
this.name = name;
this.gender = gender;
this.age = age;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the gender
*/
public boolean isGender() {
return gender;
}
/**
* @param gender the gender to set
*/
public void setGender(boolean gender) {
this.gender = gender;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
public void walk() {
System.out.println(getName()+"在行走");
}
public void eat() {
System.out.println(getName()+"在吃东西");
}
//提供main方法,创造两个人类的实例:Lucy,女,23岁;Jame,男,25岁
public static void main(String[] args) {
t1_6 t1_6 = new t1_6("Lucy", false, 23);
t1_6.walk();
t1_6.eat();
t1_6.setName("Jame");
t1_6.setGender(true);
t1_6.setAge(25);
t1_6.walk();
t1_6.eat();
}
}
7).代码阅读:给定如下Java代码,编译运行后,输出结果是什么?并解释原因。
class Base {
public Base() {
System.out.println("Base");
}
}
class Child extends Base{
public Child() {
System.out.println("Child");
}
public class Sample {
public static void main(String[] args) {
Child c = new Child();
}
}
//--------------先打印父类的 “Base”, 再打印子类的“Child”,子类继承父类的构造方法
8). 代码改错:请指出如下Java代码中存在的错误,并解释原因。
class Base {
public void method() {
}
}
class Child extends Base{
public int method() {
}
private void method() {
}
public void method(String s) {
}
}
//--------------子类不能重载父类的方法,只能重写或覆盖、子类中父类的同名方法也不可以私有。
9). 代码改错:请指出如下Java代码中存在的错误,并改正
public class Sample {
public static void main(String[] args) {
Child c = new Child();
}
}
class Base extends Object{
private String name;
public Base() {
name = "Base";
}
}
class Child extends Base{
public Child() {
super("Child");
}
}
//-----------------
// super("Child"); 出错,添加父类的含参构造方法
// public Base(String name) {
// name = "Base";
// }
10). 代码改错:请指出如下Java代码中存在的错误,并改正。
class Teacher {
public void giveLesson() {
System.out.println("知识点讲解");
System.out.println("总结提问");
}
}
class DBTeacher extends Teacher {
public void giveLesson() {
System.out.println("启动 SqlServer");
super.giveLesson();
}
public void sayHi() {
System.out.printl ("Hi");
}
}
public class Test {
public static void main(String[] args) {
Teacher t = new DBrreacher ();
t.sayHi();
t.giveLesson();
}
//-----------------
// DBTeacher 向上转型 Teacher,Teacher 的对象不能调用 DBTeacher 的方法,应该为:(代码:Test.java)
// DBTeacher t = new DBTeacher();
package T1;
//11).在员工管理系统中,有普通员工,经理,董事三种角色,公司所有的员工都有员工Id,
//员工名字,员工基本薪水(2000),请假天数;现初步定Employee类为父类,Manager子类、
//Director(董事)子类,它们的区别是计算工资方式不一样。
//具体工资计算办法:
// A、工资扣除部分:如果请假小于5天,基本工资发75%,大于5天,基本工资发50% ;
// B、经理的工资=基本工资+住房补贴(基本工资的0.2)+交通补贴(基本工资的0.5)+医疗补贴(500) ;
// C、董事的工资=基本工资+住房补贴(基本工资的0.08)+交通补贴(基本工资的0.3)+医疗补贴(2000)+娱乐补贴(3000) ;
//现完成此系统的设计。
class t1_11 {
private int id;
private String name;
private double sale;
private int qingjia;
public t1_11(int id, String name, double sale, int qingjia) {
super();
this.id = id;
this.name = name;
this.sale = sale;
this.qingjia = qingjia;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getSale() {
return sale;
}
public void setSale(double sale) {
this.sale = sale;
}
public int getQingjia() {
return qingjia;
}
public void setQingjia(int qingjia) {
this.qingjia = qingjia;
}
public void sale() {
if(getQingjia()==0){
System.out.println("工资为:"+getSale());
}else if(getQingjia()>=0 && getQingjia()<=5){
System.out.println("工资为:"+getSale()*0.75);
}else if(getQingjia()>5 && getQingjia()<=31){
System.out.println("工资为:"+getSale()*0.5);
}else{
System.out.println("错误");
}
}
}
class Manager extends t1_11 {
public Manager(int id, String name, double sale, int qingjia) {
super(id, name, sale, qingjia);
// TODO Auto-generated constructor stub
}
public void sale() {
System.out.println("工资为:"+getSale()+getSale()*0.2+getSale()*0.5+500);
}
}
class Director extends t1_11{
public Director(int id, String name, double sale, int qingjia) {
super(id, name, sale, qingjia);
// TODO Auto-generated constructor stub
}
public void sale() {
System.out.println("工资为:"+getSale()+getSale()*0.08+getSale()*0.3+2000+3000);
}
}