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一、 类和对象基础题
9.创建一个三角形类,成员变量三边,方法求周长,创建类主类A来测试它。
package com.hanqi.test; public class sanjiaoxing { private double a; private double b; private double c; public double getA() { return a; } public void setA(double a) { this.a = a; } public double getB() { return b; } public void setB(double b) { this.b = b; } public double getC() { return c; } public void setC(double c) { this.c = c; } public double getZhouchang() { return a+b+c; } } package com.hanqi.test; public class Test07 { public static void main(String[] args) { sanjiaoxing sjx=new sanjiaoxing(); sjx.setA(10); sjx.setB(20); sjx.setC(30); System.out.println("三边分别是10,20,30的周长是:"+sjx.getZhouchang()); } }
10.按要求编写Java应用程序。
(1)创建一个叫做People的类:
属性:姓名、年龄、性别、身高
行为:说话、计算加法、改名
编写能为所有属性赋值的构造方法;
(2)创建主类:
创建一个对象:名叫“张三”,性别“男”,年龄18岁,身高1.80;
让该对象调用成员方法:
说出“你好!”
计算23+45的值
将名字改为“李四”
package com.homework.zw; public class People { public String name; public int age; public String sex; public String height; People(String name, int age, String sex, String height) { this.name=name; this.age=age; this.sex=sex; this.height=height; } public String speak(String hua) { return hua; } public int add(int a,int b) { return a+b; } public String changename(String name) { this.name=name; return name; } }
package com.homework.zw; public class Text_people { public static void main(String[] args) { People pe = new People("张三",18,"男","1.80米"); System.out.println("姓名:"+pe.name+" 年龄:"+pe.age+" 性别:"+pe.sex+" 身高:"+pe.height); System.out.println("张三说:"+pe.speak("你好")); System.out.println("23+45="+pe.add(23, 45)); System.out.println("姓名改为:"+pe.changename("李四")); } }
11.按要求编写Java应用程序。
(1)创建一个叫做机动车的类:
属性:车牌号(String),车速(int),载重量(double)
功能:加速(车速自增)、减速(车速自减)、修改车牌号,查询车的载重量。
编写两个构造方法:一个没有形参,在方法中将车牌号设置“XX1234”,速
度设置为100,载重量设置为100;另一个能为对象的所有属性赋值;
(2)创建主类:
在主类中创建两个机动车对象。
创建第一个时调用无参数的构造方法,调用成员方法使其车牌为“辽
A9752”,并让其加速。
创建第二个时调用有参数的构造方法,使其车牌为“辽B5086”,车速为150,
载重为200,并让其减速。
输出两辆车的所有信息
package com.hanqi.test; public class jidongche { private String chepaihao; //车牌号 private int speed; //速度 private double weight; //载重量 //无参构造方法 jidongche() { } public String getChepaihao() { return chepaihao; } public void setChepaihao(String chepaihao) { this .chepaihao = chepaihao; } public int getSpeed() { return speed; } public void setSpeed( int speed) { this .speed = speed; } public double getWeight() { return weight; } public void setWeight( double weight) { this .weight = weight; } //有参构造方法 jidongche(String cph, int sp, double wh) { chepaihao=cph; speed=sp; weight=wh; } //设置成员方法 public int getAddspeed( int add) { return speed+=add; } public int getjianspeed( int jian) { return speed-=jian; } public void setchepaihap(String chage) { chepaihao=chage; } |
jidongche jdc=new jidongche(); jdc.setChepaihao("xx1234"); jdc.setSpeed(100); jdc.setWeight(100); System.out.println("无参构造方法车牌号为:"+jdc.getChepaihao()+"\r速度为:"+jdc.getSpeed()+"\r载重量为:"+jdc.getWeight()); jdc.setChepaihao("辽A9752"); jdc.getAddspeed(30); System.out.println("无参构造方法将车牌号改为:"+jdc.getChepaihao()+"\r速度增加到:"+jdc.getSpeed()); jidongche jdc1=new jidongche("xx1234", 150, 100); jdc1.getjianspeed(30); jdc1.setchepaihap("辽B5086"); System.out.println("有参构造方法将车牌号改为:"+jdc1.getChepaihao()+"\r速度减为:"+jdc1.getSpeed()); System.out.println("该车辆的载重量为:"+jdc1.getWeight());
12.创建一个Point类,有成员变量x,y,方法getX(),setX(),还有一个构造方
法初始化x和y。创建类主类A来测试它。
package com.hanqi.test; public class Point { private int x; private int y; Point( int xx, int yy) { x=xx; y=yy; } public int getX() { return x; } public int getY() { return y; } } |
Point pt=new Point(1,2); System.out.println("x值是"+pt.getX()+"y的值是"+pt.getY());
13.首先,编写一个类ChongZai,该类中有3个重载的方法void print();其次,
再编写一个主类来测试ChongZai类的功能。
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package liu0919; public class ChongZai { public int max( int a, int b) { return a >= b ? a : b; } //参数个数相同,数据类型不相同,不冲突 public double max( double a, double b) { return a >= b ? a : b; } //参数个数不同,数据类型相同,不冲突 public double max( double a, double b, double c) { return max(max(a, b), c); } } |
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package liu0919; public class Ceshi_chongzai { public static void main(String[] args) { ChongZai cz= new ChongZai (); System.out.println( "58和12大的数是:" +cz.max( 58 , 12 )); System.out.println( "58.12和12.24大的数是:" +cz.max( 58.12 , 12.24 )); System.out.println( "18.1与25.5和30.0比较大的是:" +cz.max( 18.1 , 25.5 , 30.0 )); } } |
package com.hanqi.test; public class Point { private int x; private int y; Point( int xx, int yy) { x=xx; y=yy; } public int getX() { return x; } public int getY() { return y; } } |
Point pt=new Point(1,2); System.out.println("x值是"+pt.getX()+"y的值是"+pt.getY());
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原文地址:http://www.cnblogs.com/hanruyue/p/5887111.html