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聲明為私有。為MyTime類定義構造方法以方便創(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應聲明為私有。編寫構造方法賦予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();
????}}

以上就是動力節(jié)點java培訓機構的小編針對“Java面向?qū)ο蟪绦蛟O計練習題”的內(nèi)容進行的回答，希望對大家有所幫助，如有疑問，請在線咨詢，有專業(yè)老師隨時為你服務。