题目内容

以下程序会抛出哪种异常?() publicclassTest{ public static void main(String[] args) { System.out.println(1 / 0); } }

ArithmeticException
B. ArrayIndexOutOfBoundsException
C. StringIndexOutOfBoundsException
D. ClassCastException
E. No exception

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下列哪项是在抽象类中声明抽象方法?()

A. public abstract method();
B. public abstract void method();
C. public void abstract Method();
D. public abstract void method() {}

import java.io.;public class Prog1{ public static void main(String args[]) throws IOException { int i,L; String s; StringBuffer dest; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in)); s=buf.readLine(); L=s. ; dest=new StringBuffer(L); /SPACE*/ for( i=L-1; ;i--) dest.append(s. ); System.out.println(dest. ); } }

import javax.swing.; import javax.swing.event.; import java.awt.; import java.awt.event.; public class java3 extends JFrame { private JLabel text = new JLabel( "Sample Text",JLabel.CENTER ); private static final int MIN_POINTS = 8; private static final int MAX_POINTS = 36; private JSlider sizer = new JSlider(); public java3( String titleText ) { super( titleText ); getContentPane().add( text, BorderLayout.CENTER ); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);______ ; sizer.setMaximum( MAX_POINTS ); sizer.setValue( text.getFont().getSize() ); sizer.setMajorTickSpacing( 4 ); sizer.setMinorTickSpacing( 1 ); sizer.setPaintLabels( true ); sizer.setPaintTicks( true );sizer.addChangeListener( { public void stateChanged( ChangeEvent e ) { Font of = text.getFont(); Font nf = new Font( of.getName(), of.getStyle(), sizer.getValue() ); text.setFont( nf ); text.repaint(); } } ); JPanel sliderPanel = new JPanel( new BorderLayout() ); ; sliderPanel.add( sizer, BorderLayout.SOUTH ); getContentPane().add( sliderPanel, BorderLayout.SOUTH ); setSize( 250, 175 ); setVisible( true ); } public static void main( String[] args ) { new java3( "java3" );

import javax.swing.; import java.awt.; import java.awt.event.;/SPACE*/ public class java3 { private String line1 = "", line2 = ""; private String line3 = ""; private JTextArea textArea; public java3() { super( "java3" ); textArea = new JTextArea( 10, 15 ); textArea.setText( "Press any key on the keyboard..." ); textArea.setEnabled( false ); addKeyListener( this ); getContentPane().add( textArea ); setSize( 350, 100 ); show(); } public void keyPressed( KeyEvent e ) { line1 = "Key pressed: " + e.getKeyText( e.getKeyCode() ); setLines2and3( e ); } public void keyReleased( KeyEvent e ) { line1 = "Key released: " + e.getKeyText( e.getKeyCode() ); setLines2and3( e ); } public void keyTyped( KeyEvent e ) { ; setLines2and3( e ); } private void setLines2and3( KeyEvent e ) { line2 = "This key is " + ( e.isActionKey() ? "" : "not " ) + "an action key"; String temp = e.getKeyModifiersText( e.getModifiers() ); line3 = "Modifier keys pressed: " + ( temp.equals( "" ) ? "none" : temp ); textArea.setText( line1 + "\n" + line2 + "\n" + line3 + "\n" ); } public static void main( String args[] ) { java3 app = new java3(); __ { public void windowClosing( WindowEvent e ) { System.exit( 0 ); } } ); } }