二级java考试真题(1).docx

第一套：1. import java.io.*;public class Java_1 public static void main(String args) char a=r; byte b=8; int i=55; /*Found* long_ n=1024L; float f=103.7f; /*Found* double_ d=954.2431; int a1=a+i; long n1=n-a1; float f1=b*f; double d1=f1/a1+d; System.out.println(a1=+a1); System.out.println(n1=+n1); System.out.println(f1=+f1); System.out.println(d1=+d1); 2. import java.util.Random;public class Java_2 public static void main(String args)Random random = new Random();float p = random.nextFloat();/产生0.0与1.0之间的一个浮点数int n = Math.round(10*p); /构造10以内的一个整数long f = 1 ; /保存阶乘的结果int i = 1 ; /循环变量 /*Found* do _f*=i_; i+; /*Found* _while(i=n); _ System.out.println(n+!= +f); 3. public class Java_3int x,y; /点的坐标public Java_3() /无参数的构造方法 /*Found* /带两个参数的构造方法 public Java_3(int x,int y)_ this.x=x;this.y=y;_ /*Found* /带一个参数的构造方法 public Java_3(Java_3 p) x=p.x;y=p.y;_ public Java_3 getLocation() /以对象的形式返回当前点的位置 /*Found* /实例化一个Java_3对象p Java_3 p=new Java_3(x,y) _; /*Found* /返回对象p _return p_; public int getX()return x; /返回点的横坐标public int getY()return y; /返回点的纵坐标public void move(int x,int y)this.x = x;this.y = y; /把当前点移到新的位置（x，y）上public String toString()return (+x+,+y+); /以(x，y)的格式返回点的位置public void translate(int x,int y)this.x += x;this.y += y; /在原有坐标上分别增加x和y/主方法public static void main(String args) /*Found* /生成一个对象(5,5) Java_3 p=_new Java_3(5,5)_; System.out.println(x=+ p.x+ y=+ p.y); System.out.println(Location is+ p.toString(); /以(x,y)的方式打印坐标的位置 /*Found* /在原有位置上增加（3，4） p.translate(3,4) _; System.out.println(x=+ p.x+ y=+ p.y); /打印横坐标和纵坐标的值 System.out.println(Location is+ p.toString(); /以(x,y)的方式打印坐标的位置第二套：1. import javax.swing.JOptionPane; /导入JOptionPane类public class Java_1 public static void main( String args ) /*Found* JOptionPane._ showMessageDialog_( null, 欢迎n你n参加nJavan考试! ); System.exit( 0 ); / terminate the program 2. public class Java_2 public static void main(String args) int aMatrix = 1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5;int i = 0; /循环变量int j = 0; /循环变量 /print matrix for(i = 0; i aMatrix.length; i+) /*Found* for ( j = 0; jaMatrixi.length_; j+) /*Found* System.out.print(_aMatrixij_+ ); System.out.println(); 3. import java.awt.event.*;import java.awt.*;import javax.swing.*;import java.text.*;/*Found*public class Java_3 extends JFrame_ implements ActionListener private JTextField input1, input2, output; private int number1, number2; private double result; / 初始化 public Java_3() /*Found* super_( 示范异常 ); Container c = getContentPane(); c.setLayout( new GridLayout( 3, 2 ) ); c.add( new JLabel( 输入分子,SwingConstants.RIGHT ) ); input1 = new JTextField( 10 ); c.add( input1 ); c.add(new JLabel( 输入分母和回车,SwingConstants.RIGHT ) ); input2 = new JTextField( 10 ); c.add( input2 ); input2.addActionListener( this ); c.add( new JLabel( 计算结果, SwingConstants.RIGHT ) ); output = new JTextField(); c.add( output ); setSize( 300, 100 ); show(); /处理 GUI 事件 public void actionPerformed( ActionEvent e ) DecimalFormat precision3 = new DecimalFormat( 0.000 ); output.setText( ); /空的JTextField输出 try number1 = Integer.parseInt( input1.getText() ); number2 = Integer.parseInt( input2.getText() ); result = quotient( number1, number2 ); /*Found* _ output.setText(precision3.format(result)_; catch ( NumberFormatException nfe ) /*Found* _JOptionPane.showMessageDialog_( this, 你必须输入两个整数, 非法数字格式, JOptionPane.ERROR_MESSAGE ); catch ( Exception dbze ) /*Found* _JOptionPane.showMessageDialog_( this, 除法异常, 除数为零, JOptionPane.ERROR_MESSAGE ); / 定义求商的方法，如遇除数为零时，能抛出异常。 public double quotient( int numerator, int denominator )throws Exception if ( denominator = 0 )throw new Exception(); return ( double ) numerator / denominator; public static void main( String args ) Java_3 app = new Java_3(); app.addWindowListener( new WindowAdapter() public void windowClosing( WindowEvent e ) e.getWindow().dispose(); System.exit( 0 ); ); 第三套：1. /用一个打印语句输出多行结果public class Java_1 public static void main( String args ) /*Found* System.out.println(_欢迎n你n参加n计算机n等级考试_); 2. import java.awt.*;import java.awt.event.*;public class Java_2 extends Frame public Java_2(String s)super(s);public static void main(String args) Java_2 fr = new Java_2(Testing); Button b=new Button(Please press me!); /*Found* b.addActionListener(_new HandleButton()_); fr.add(b); fr.pack(); /*Found* fr.addWindowListener(new _WindowAdapter_()public void windowClosing(WindowEvent e) System.exit(0); ); fr.setVisible(true);class HandleButton implements ActionListener public void actionPerformed(ActionEvent e)System.out.println(The button is pressed!); 3. /*Found*import javax.swing_.*;public class Java_3 public static void main( String args ) String s1, s2, s3, s4, output;/声明5个字符串引用 /初始化字符串 s1 = new String( 您好！ ); s2 = new String( 您好！ ); / 判别字符串相同否 if (s1 = s2 ) output = s1 和 s2 是内存中同一个对象; else output = s1 和 s2 不是内存中同一个对象; /判别字符串内容相等否 /*Found* if (s1.equals(s2)_ ) output += ns1 和 s2内容相等; else output += ns1 和s2 内容不相等are not equal; / 用intern()方法来获得与对象s1，s2内容都是您好！字符串的引用s3 和 s4 /*Found* s3 = s1_.intern()_; /*Found* s4 = s2_.intern()_; /判别s3和s4是否是内存中相同的对象 if ( s3 = s4 ) output += ns3 和s4 是内存中同一个对象; else output += ns3 和 s4 不是内存中同一个对象; /判别s1和s3是否引用同一个对象 if ( s1 = s3 ) output += ns1和s3是内存中同一个对象; else output += ns1和s3不是内存中同一个对象; / 判别s2和s4是否是内存中相同的对象 if ( s2 = s4 ) output += ns2和s4是内存中同一个对象; else output += ns2和s4不是内存中同一个对象; /判别s1和s4是否是内存中同一个对象 if ( s1 = s4 ) output += ns1和s4是内存中同一个对象; else output += ns1和s4不是内存中同一个对象; JOptionPane.showMessageDialog( null, output, /*Found* _示范String的intern（）方法_, JOptionPane.INFORMATION_MESSAGE ); System.exit( 0 ); 第四套：1import javax.swing.JApplet; / import class JAppletimport java.awt.Graphics; / import class Graphicspublic class Java_1 extends JApplet /*Found* public void paint( _Graphics_ g ) g.drawString( 欢迎你参加Java考试!, 25, 25 ); 2. import java.io.*;public class Java_2 public static void main(String args) throws IOException File inputFile; File outputFile; FileInputStream in; FileOutputStream out; int c; inputFile = new File(source.txt); outputFile = new File(dest.txt); in = new FileInputStream(inputFile); /*Found* _out = new FileOutputStream_(outputFile); while (c = in.read() != -1) /*Found* _ out.write(c)_; in.close(); out.close(); 3. import javax.swing.JOptionPane;public class Java_3 public static void main( String args ) String firstNumber, / 用户输入第1个字符串 secondNumber, / 用户输入第2个字符串 result; / a string containing the output int number1, / 比较的第1个数 number2; / 比较的第2个数 /读用户输入的第1个字符串 read first number from user as a string firstNumber = JOptionPane.showInputDialog( Enter first integer: ); /读用户输入的第2个字符串read second number from user as a string secondNumber = JOptionPane.showInputDialog( Enter second integer: ); / 将字符串类型转换成整数类型 number1 = Integer.parseInt( firstNumber ); number2 = Integer.parseInt( secondNumber ); result = ; /*Found* if ( number1 = number2 ) result = number1 + = + number2; if ( number1 != number2 ) result = number1 + != + number2; if ( number1 number2 ) result = result + n + number1 + number2 ) result = result + n + number1 + + number2; if ( number1 = number2 ) result = result + n + number1 + = number2 ) result = result + n + number1 + = + number2; /显示结果 /*Found* _JOptionPane.showMessageDialog_( null, result, 比较结果 , /*Found* _JOptionPane._INFORMATION_MESSAGE ); /程序正常退出 /*Found* _ System.exit(0)_; 第五套: 1. import javax.swing.JApplet;import java.awt.Graphics;/*Found*public class Java_1 extends _JApplet_ public void paint( Graphics g ) g.drawString( 欢迎你来参加, 25, 25 ); g.drawString( Java 语言考试!, 25, 40 ); 2. import java.awt.* ;import java.applet.* ;public class Java_2 extends Applet String s; public void init() /*Found* s = getParameter(_strings_); public void paint(Graphics g)g.drawString(s,20,20); 3. import javax.swing.*; /*Found*import _ java.text_.*;public class Java_3 public static void main( String args ) /*Found* SimpleTime t = new _ SimpleTime_ ( 12, 30, 19 ); /*Found* _ JOptionPane.showMessageDialog_( null, t.buildString(), Demonstrating the this Reference, /*Found* _JOptionPane_.INFORMATION_MESSAGE ); System.exit( 0 ); class SimpleTime private int hour, minute, second; public SimpleTime( int hour, int minute, int second ) this.hour = hour; /*Found* _this.minute_ = minute; this.second = second; public String buildString() /*Found* return this.toString(): +_this.toString()_ + ntoString(): + toString() + nthis (with implicit toString() call): + this; public String toString() DecimalFormat twoDigits = new DecimalFormat( 00 ); return twoDigits.format( this.hour ) + : + twoDigits.format( this.minute ) + : + twoDigits.format( this.second ); 第六套：1public class Java_1 public static void main(String args) final char chrA=A; char chrDisplay; /*Found* for(int i=0;ib) t=a; a=b; _b=t_; if(ac) t=a; a=c; c=t; /*Found* if(_bc_) t=b; b=c; c=t; System.out.println(a=+a+,b=+b+,c=+c); 2. import java.util.*;import java.io.*;public class Java_2 public static void main(String args) int a,b,c; Random r=new Random(); for(int i=0;i3200;i+) try /*Found* a=r._ nextInt_() ; /得到一个随机数 /*Found* b=r._ nextInt_() ; /得到一个随机数 c=a/b; /*Found* _ catch_(Exception e) System.out.println(不能被零除!) ; c=0; System.out.println(结果为:+c) ; 3. import javax.swing.*;import java.awt.event.*;import java.awt.*;public class Java_3 private static JLabel lbl; private static JTextArea txt; public static void main(String args) JFrame frame=new JFrame(全国计算机等级考试); lbl=new JLabel(); txt=new JTextArea(); frame.getContentPane().add(txt,BorderLayout.CENTER ); frame.getContentPane().add(lbl,BorderLayout.SOUTH ) ; /*Found* frame._ addWindowListener_(new WindowHandler() ;/注册监听器WindowHandler /*Found* txt.addMouseMotionListener(new _() public void mouseMoved(MouseEvent e) String strTemp; strTemp=当前鼠标位置:(+e.getX() +,+e.getY() +); /*Found* lbl._ setText_(strTemp);/显示出鼠标位置 ) ; frame.setSize(200,150) ; frame.show() ; class WindowHandler implements WindowListener public void windowOpened(WindowEvent e) public void windowClosing(WindowEvent e) System.exit(0) ; public void windowClosed(WindowEvent e) public void windowIconified(WindowEvent e) public void windowDeiconified(WindowEvent e) public void windowActivated(WindowEvent e) public void windowDeactivated(WindowEvent e) 第八套:1. import javax.swing.*;import java.awt.event.*;import java.awt.*;public class Java_1 public static void main(String args) JFrame frame=new JFrame(全国计算机等级考试); JButton btnExit=new JButton(退出(X); btnExit.setMnemonic(KeyEvent.VK_X ) ; btnExit.addActio