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首页 > 题库 > Java语言程序设计（一）（04747）

Java规定，switch关键字之后的表达式的值必须是与型赋值相容的。

语句System.out.println(1== 1>> > > 32);的输出是。

类似于小巧的CPU且能够实现Java语言平台无关性的机制是Java__。

关于组件、事件及事件侦听，叙述正确的是

Reader是一个读取

能创建BufferedReader对象的Java程序代码是

某程序中有如下的类及对象的定义: class ParentClass {}class SubClass1 extends ParentClass {}class SubClass2 extends ParentClass {}ParentClass a = new ParentClass ();SubClass1 b = new SubClass1();SubClass2 c = new SubClass2();当执行语句b= (SubClass1)c;时，结果是

下列叙述中，不正确的是

下面程序片段输出的结果是int m=7, n=1;do{if(m--<++n) break;}while(m>4);System.out.println("m = "+m+" n=" +n);

在Java中，用package语句说明一个包时，该包的层次结构必须

若有语句int a=8, b=2, k;，则表达式的值不为4的是

能正确声明一个boolean类型变量a并赋初值的是

有Java源程序文件Test1.java:public class Test1 {public static void main(String[] args) {}}class MyClass1 {}class MyClass2 {}正确编译Test1.java后，生成的类文件个数是

类Statement显示一个窗口，其中含有一个标签、一个文本域和一个按钮。初始时，文本域中显示“This is a JFrame!”，如题33图所示。注：要求你将方法go()中的代码补充完整，不需要实现事件处理。题33图import java.awt.;import java.awt.event.;import javax.swing.*;public class Test33{public static void main(String args []){Statement be = new Statement();be.go();}class Statement extends WindowAdapter implements ActionListener{JFrame f; JButton myButton; JLabel myLabel; JTextField tfs;String ad = " This is a JFrame!";public void go(){f= new JFrame("My JFrame");f.setLayout(new GridLayout(6, 1, 10, 10));f.setSize(650, 400);myLabel = new JLabel("Statement");JPanel panl = new JPanel( );JPanel pan2 = new JPanel( );panl.setLayou(new FlowLayout(FlowLayout.CENTER, 40, 0); .//请在答题卡(纸)上填写此处应编写的代码f.addWindowListener(his);f.setVisible(true);}public void windowClosing(WindowEvente) {System.exit(0);}}

设有大于3的奇整数n。请编写方法void printArray(int[][] arr)，该方法的功能是在屏幕上输出n行n列数组arr中特殊位置的数据。以7行7列的方阵为例，标注“x”的即是这些特殊位置。输出的元素次序任意，但不允许有重复。 void printArray(int[]0 arr){//请在答题卡(纸)上填写此处应编写的代码}

阅读程序，请写出该程序的输出结果。public class Test31 implements Runnable{public void run(){try {System out printn("run()-<1>"):Thread.sleep(10);Sytemout.pintn("run()-<2>");}catch (InterruptedExceptionx) {Systemoutprintln("run0)-<3>");return;}System.out.printn("run()-<4>");System.out.println("nun()-<5>");}public static void main(String[] args){Test31 one = new Test31();Thread other = new Thread();Thread third = new Thread(one);other.start); third.start();try {System.out.println("run()-<6>");Thread-sleep(200);}catch (InteruptedExceptionx) {}System.out.printn("main0)-<7>");other.interrupt();]}}

阅读程序，请写出该程序的功能。import java.io.BufferedReader; import java.io.lOException;import java.io.InputStreamReader;class MyStringException extends Exception{public MyStringException(){ super("too long"); }public MyStringException(String message){ super(message); }}public class Test30{public statie void main(String[] args) throws IOException {int maxLength= Integer.parseInt(args[0]);BufferedReader keyboard=new BufferedReader(newInputStreamReader(System.in));try{String input=keyboard.readLine();if(input.length)<maxLength) System.out.println(input);else throw new MyStringException();}catch(MyStringException e){System.out.println(e.getMessage());}}}

阅读程序，请写出该程序的输出结果。class SuperClass {String name;SuperClass(String n){ name= n; }public void method(){System.out.print(name+" ");System.out.println("superelass!");}}class SubClass extends SuperClass {public SubClass(String n){ super(n); }public void method(){super.method();System.out.println("subclass!");}}public class Test29{public static void main(String args[]){SuperClass superc = new SuperClass("Super");SubClass sube = new SubClass("Sub1");SuperClass ssc = new SubClass("Sub2");superc.method(); subc.method(); ssc.method();}}

以下程序当点击组合框中的选项时，在下面的文本区中将显示相关的信息。例如，当依次点击了“One”、“Two”和“Three”后，显示结果如题28图所示。初始时，组合框中显示“Three”，文本区中显示空白。题28图import java.awt.; import java.awt.event. ; import javax.swing.;import javax.swing.border.; public class Test28{public static void main(String[] aargs){JComboBoxDemo cbd = new JComboBoxDemo);cbd.go();}}class JComboBoxDemo implements ActionListener{JFrame frame = new JFrame ("JComboBox Demo");JComboBox <String> jcb;JTextArea ta = new JTextArea(0, 30);JPanel pl = new JPanel(); JPanel p2 = new Jpanel(); JPanel p3 = new JPanel();String[] itemList = { "One", "Two", "Three", "Four", "Five" };public void go() {jcb = new JComboBox<String>(itemList); pl.add(jcb);jcb.___ _①_;Border etched = BorderFactory.createEtchedBorder();Border border = BorderFactory.createcTitledBorder(etched, "Uneditable");p.setBorder(border);JScrollPane jp = new JScrollPane(ta);p2.setLayou(new BorderLayout()); p2.add(jp);border = BorderFactory.createTitledBorder(etched,"Results"); p2.setBorde(border);jcb.②________;p3.setLayout(new BorderL ayout()); p3.add(p1);Container cp = frame.getContentPane(;cp.setLayou(new GridLayout(0,1)); cp.add(p3); cp.add(p2);frame.pack(); frame.setVisible(true);frame.setDefaultCloseOperation(JFrame.EXIT_ ON_CLOSE);}public void actionPerformed(ActionEvent e) {JComboBox jcbcurrent = (JComboBox)e.getSource();if (jcbcurrent == jcb) {ta.append("In Item "+___③_ +" inserted");}}}

以下程序定义了父类Employee和子类Manager。程序将输出：Jim 2。class Employee{private String name;static int ID=0;public Employee(String s){name= s;ID++;}String getName(){ returm name; }int getID(){ retum ID; }}class Manager extends Employee{private String department;public Manger(String s, Sting d){_①___;department= d;}String getDepart(){ returm department; }}public class Test27{public static void main(Sring[] args) {Employee jim = new Employe("Jim");Manager adom = new Manager("Adom", "HR");System.out. println(jim._②______+*"+jm._③_______);}}

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