2016年java考试试题及答案

简答应用题

1.下面程序运行后，可以使用上下左右键移动组件。 补充下画线部分的代码。

import java.awt.*;

import java.awt.event.*;

public class E6 extends Frame implements keyListener

{

TextField b1;

int x,y;

E6()

{

setLayout (new FlowLayout());

b1 = new TextField("走");

__[1]__

b.addkeyListener(this);

setSize (200,120);

addWindowListener(new WindowListener()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

}

public void keyPressed(KeyEvent e)

{

x=b1.getBouds().x;

y=b1.getBouds().y;

if(e.getKeyCode()==__[2]__)

{

y=y-3;

if(y<=1)y=50;

b1.setLocation(x,y);

}

if(e.getkeyCode()==keyEven.VK_DOWN)

{

y=y+3;

if(y>=100)y=50;

b1.setLocation(x,y);

}

if(e.getkeyCode()==keyEvent.VK_LEFT)

{

x=x-3;

if(x<=1)x=50;

__[3]__;

}

if(e.getkeyCode()==keyEvent.VK_RIGHT)

{

x=x+3;

if(x>=100)x=50;

b1.setLocation(x,y);

}

}

public void keyTyped(KeyEvent e)

{}

public void keyReleased(KeyEvent e)

{}

public static void main (String args[])

{

E6 a = new E6();

__[4]__;

}

}

2.下面程序是从命令窗口界面输入圆半径，然后计算球圆面积与周长。把划线部分填上语句，将程序补充完整。

import java.io.*;

public class Qiumianji

{

public static void main (String args[ ])

{

int a = 0;

double b,c;

Sting s;

try{

BufferedReader br =new BufferedReader (new InputStreamReader (___【1】__));

s = br.readLine();

a = __【2】__;

}

catch(IOExcepion e)

{}

b = 3.14*a*a;

c = 2*3.14*a;

System.out.println(”该圆面积为”+b+””+”周长为”+c);

}

}

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