二级java上机题库及答案！！考java的同学很值得一看

全国计算机等级考试二级 Java 捷成模拟上机试题

全部是程序填空题，需要填空的语句用”//”注释了，答案就是该语句后面的语句

1.

"//计算两个整数的乘法

import javax.swing.JOptionPane;

public class Java_1 {

public static void main( String args[] ) {

int x, y, result;

x = Integer.parseInt( xVal );

y = Integer.parseInt( yVal );

result = x * y;

//*********Found********

// JOptionPane._________________________( null, ""两个数的积: "" + result );

JOptionPane.showMessageDialog( null, ""两个数的积: "" + result );

System.exit( 0 );

}

}

{

//*********Found********

// _________________________(""欢迎 你 参加Java 考试"");

System.out.print(""欢迎 你 参加Java 考试"");

}

}

"

3.

"import java.io.*;

public class Java_1 {

try{

// DataOutputStream out = new ______________________(

new FileOutputStream(""test.dat""));

for(int i =0; i<charArray.length; i++){

out.writeChar(charArray[i]);

DataInputStream in = new DataInputStream(

//*********Found**********

c=in.readChar();

System.out.print(c+"" "");

}

System.out.println();

//*********Found**********

// in.____________________();

in.close();

}catch(IOException e){}

}

}

"import javax.swing.*;

//*********Found**********

// public static ___________________ main( String args[] ){

public static void main( String args[] ){

SimpleTime t = new SimpleTime( 12, 30, 19 );

//*********Found**********

// ___________________.showMessageDialog( null, t.buildString(),

JOptionPane.showMessageDialog( null, t.buildString(),

"" \""this\"" 引用示范"",

JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );

}

private int hour, minute, second;

this.hour = hour;

this.second = second;

}

// return ""this.toString(): "" + ___________________() +

return ""this.toString(): "" + this.toString() +

}

public String toString(){

DecimalFormat twoDigits = new DecimalFormat( ""00"" );

return twoDigits.format( this.hour ) + "":"" +

twoDigits.format( this.minute ) + "":"" +

twoDigits.format( this.second );

}

}

"

public static void main( String args[] ){

PackageData d = new PackageData();

String output;

output = ""实例化后:\n"" + d.toString();

d.x = 77; //修改包访问的数据

//*********Found**********

d.s = ""祝您成功!""; //修改包访问的数据

//*********Found**********

// JOptionPane.______________________( null, output,

""对包的访问示范"",

System.exit( 0 );

}

class PackageData {

x = 0;

s = ""Hello"";

}

}

"

6.

public class Java_1 {

public static void main( String args[] )

{

//*********Found********

System.exit( 0 ); // 结束程序

/* JOptionPane 类的常用静态方法如下：

showInputDialog()

showConfirmDialog()

showMessageDialog()

showOptionDialog()

*/"

7.

"//Interest.java

import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public static void main( String args[] ){

DecimalFormat precisionTwo = new DecimalFormat( ""0.00"" );

// JTextArea outputTextArea = new ____________________( 11, 20 );

JTextArea outputTextArea = new JTextArea( 11, 20 );

outputTextArea.append( year + ""\t"" +

//*********Found**********

//*********Found**********

// JOptionPane._____________________(

JOptionPane.showMessageDialog(

null, outputTextArea, ""复合利息"",

JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );

}

}

"

8.

"//分析球队升级程序

//初始化变量

int passes = 0, //考试及格的队员数

failures = 0, //考试不及格的队员数

student = 1, //学生计数器

result; //分析结果

String input, //输入值

//10 个队员,用计数器控制循环

while ( student <= 10 ) {

input = JOptionPane.showInputDialog(

""输入队员考核结果 (1=及格,2=不及格)"" );