Java面向?qū)ο蟪绦蛟O(shè)計練習(xí)題

1.類的成員變量猜數(shù)字游戲一個類A有一個成員變量v有一個初值100。定義一個類對A類的成員變量v進行猜。如果大了則提示大了小了則提示小了。等于則提示猜測成功。

import?java.util.*;public?class?lianxi{????public?static?void?main(String[]?dsa)????{????A?a=new?A();????Scanner?input=new?Scanner(System.in);????while?(1==1)????{????????System.out.println("請猜測數(shù)字");????????int?i=input.nextInt();????????if?(ia.v)????????{????????????System.out.println("大了");????????????continue;????????}????????else????????{????????????System.out.println("恭喜你猜對了！");????????????break;????????}????}????}}class?A{????public?int?v=100;}

2.類的成員變量請定義一個交通工具(Vehicle)的類其中有:屬性速度(speed)體積(size)等等方法移動(move())設(shè)置速度(setSpeed(int speed))加速speedUp(),減速speedDown()等等.最后在測試類Vehicle中的main()中實例化一個交通工具對象并通過方法給它初始化speed,size的值并且通過打印出來。另外調(diào)用加速減速的方法對速度進行改變。

public?class?Vehicle{????private?int?speed;????private?String?size;????public?void?move()????{????System.out.println("i'm?moving");????}????public?void?setSpeed(int?speed)????{????????System.out.println("now?i'm?running?with"+speed+"per?hour");????}????public?void?speedUp()????{????????Vehicle?v=new?Vehicle();????????v.setSpeed(1000);????}????public?void?speedDown()????{????Vehicle?v=new?Vehicle();????????v.setSpeed(20);????}????public?static?void?main(String[]?dsa)????{????Vehicle?v=new?Vehicle();????v.speed=100;????v.size="50/m^3";????System.out.println("the?initial?speed?is"+v.speed+"and?my?size?is?"+v.size);????v.speedUp();????v.speedDown();????}}

3.類的成員變量與方法、構(gòu)造方法在程序中經(jīng)常要對時間進行操作但是并沒有時間類型的數(shù)據(jù)。那么我們可以自己實現(xiàn)一個時間類來滿足程序中的需要。定義名為MyTime的類其中應(yīng)有三個整型成員時hour分minute秒second為了保證數(shù)據(jù)的安全性這三個成員變量應(yīng)聲明為私有。為MyTime類定義構(gòu)造方法以方便創(chuàng)建對象時初始化成員變量。再定義diaplay方法用于將時間信息打印出來。為MyTime類添加以下方法addSecond(int sec)addMinute(int min)addHour(int hou)subSecond(int sec)subMinute(int min)subHour(int hou)分別對時、分、秒進行加減運算。

public?class?MyTime{????private?int?hour;????private?int?minute;????private?int?second;????public?MyTime(int?x,int?y,int?z)????{????this.hour=x;????this.minute=y;????this.second=z;????}????public?void?display()????{????System.out.println("the?time?is?"+this.hour+":"+this.minute+":"+this.second);????}????public?void?addHour(int?hou)????{????this.hour=this.hour+hou;????}????public?void?addSecond(int?sec)????{????this.second=this.second+sec;????}????public?void?addMinute(int?min)????{????this.minute=this.minute+min;????}????public?void?subHour(int?hou)????{????this.hour=this.hour-hou;????}????public?void?subMinute(int?min)????{????this.minute=this.minute-min;????}????public?void?subSecond(int?sec)????{????this.second=this.second-sec;????}}

04.構(gòu)造方法 編寫Java程序模擬簡單的計算器。 定義名為Number的類其中有兩個整型數(shù)據(jù)成員n1和n2應(yīng)聲明為私有。編寫構(gòu)造方法賦予n1和n2初始值再為該類定義加addition、減subtration、乘multiplication、除division等公有成員方法分別對兩個成員變量執(zhí)行加、減、乘、除的運算。 在main方法中創(chuàng)建Number類的對象調(diào)用各個方法并顯示計算結(jié)果。

public?class?Number{????private?int?x;????private?int?y;????public?Number(int?x,int?y)????{????this.x=x;????this.y=y;????}????public?void?plus()????{????System.out.println("the?result?is:"+(this.x+this.y));????}????public?void?except()????{????System.out.println("the?result?is?:"+(this.x-this.y));????}????public?void?multiplication()????{????System.out.println("the?result?is?:"+(this.x*this.y));????}????public?void?division()????{????System.out.println("the?result?is?:"+(this.x/this.y));????}????public?static?void?main(String[]?dsa)????{????Number?lian=new?Number(4,4);????lian.plus();????lian.except();????lian.multiplication();????lian.division();????}}

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