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单选题
Given an ActionEvent, which method allows you to identify the affected Component?()
A
Public class getClass()
B
Public Object getSource()
C
Public Component getSource()
D
Public Component getTarget()
E
Public Component getComponent()
F
Public Component getTargetComponent()
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Given:Which two, inserted at line 11, will allow the code to compile?()
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Given:Which method will complete this class?()
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考题
本题的功能是在文本域面板中添加一个带有行数的面板。窗口中有一个文本域,在文本域的左侧有一个带有数字的面板,该面板上的数字指示着文本域中的行数。import javax.swing.*;import javax.swing.event.*;import java.awt.*;public class java3 extends JFrame{public static JTextPane textPane;public static JScrollPane scrollPane;JPanel panel;public java3(){super("java3()");panel=new JPanel();panel.setLayout(new BorderLayout());panel.setBorder(BorderFactory.createEmptyBor-der(20,20,20,20));textPane=new JTextPane();textPane.setFont(new Font("monospaeed",Font.PLAIN,12));scrollPane=new JScrollPane(textPane);panel.add(scrollPane);scrollPane.setPreferredsize(new Dimension(300,250));setContentPane(panel);setCloseOperation(JFrame.EXIT_ON_CLOSE);LineNumber lineNumber=new LineNumber();scrollPane.setRowHeaderView(lineNumber);}public static void main(String[]args){java3 ttp=new java3();ttp.pack();ttp.setVisible(true);}}class LineNumber extends JTextPane{private final static Color DEFAULT_BACK-GROUND=Color.gray;private final static Color DEFAULT_FORE-GROUND=Color.black;private final static Font DEFAUl。T—FONT=newFont("monospaced",Font.PLAIN,12);private final static int HEIGHT=Integer.MAX_VALUE-1000000;private final static int MARGIN=5;private FontMetrics fontMetrics;private int lineHeight;private int currentRowWidth;private JComponent component;private int componentFontHeight;private int componentFontAscent;public LineNumber(JComponent component){if(component= =null){setBackground(DEFAULT_BACKGROUND);setForegroun"DEFAULT_FOREGROUND);setFont(DEFAULT FONT);this.component=this;}else{setBaekground(DEFAULT_BACKGROUND);setForeground(component.getForeground());setFont(component.getFont());this.component=component;}componentFontHeight=component.getFontMet-rics(component.getFont()).getHeight();componentFontAscent=component.getFontMet-ries(component.getFont()).getAscent();setPreferredWidth(9999);}public void setPreferredWidth(int row){int width=fontMetrics.stringWidth(String.val-ueOf(row));if(currentRowWidth<;width){currentRowWidth=width;setPreferredSize(new Dfimension(2 * MARGIN+width,HEIGHT));}}public void setFont(Font font){super.setFont(font);fontMetrics=getFontMetrics(getFont());}public int getLineHeight(){if(hneHeight= =0)return componentFontHeight;elsereturn lineHeight;}public void setLineHeight(int lineHeight){if(hneHeight>;0)this.lineHeight=lineHeight;}public int getStartOffset(){return component.getlnsets().top+component-FontAscent;}public void paintComponent(Graphics g){int lineHeight=getLineHeight();int startOffset=getStartOffset();Rectangle drawHere=g.getClipBounds();g.setColor(getBackground());g.fillRect(drawHere.x,drawHere.Y,drawHere.width,drawHere.height);g.setColor(getForeground());int startLineNumber=(drawHere.y/line-Height)+1;int endLineNUmber = startLineNumber+(drawHere.height/lineHeight);int start=(drawHere.Y/hneHeight)*line-Height+startOffset;for(int i=startLineNumber;i<;=endLineN-umber;i++){String lineNumber=String.valueOf(i);int width=fontMetrics.stringWidth(lineNumber);g.drawstring(lineNumber,MARGIN+current-RowWidth-width,start);start+=lineHeight:}setPreferredWidth(endLineNumber);}}
考题
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考题
class super { public float getNum() {return 3.0f;} } public class Sub extends Super { } Which method, placed at line 6, will cause a compiler error?()A、 Public float getNum() {return 4.0f; }B、 Public void getNum (){}C、 Public void getNum (double d){}D、 Public double getNum (float d) {retrun 4.0f; }
考题
Which three demonstrate an “is a” relationship?() A、 public class X { } public class Y extends X { }B、 public interface Shape { } public interface Rectangle extends Shape{ }C、 public interface Color { } public class Shape { private Color color; }D、 public interface Species { } public class Animal { private Species species; }E、 public class Person { } public class Employee { public Employee(Person person) { }F、 interface Component { } class Container implements Component { private Component[] children; }
考题
Which two allow the class Thing to be instantiated using new Thing()?A、 public class Thing { }B、 public class Thing { public Thing() {} }C、 public class Thing { public Thing(void) {} }D、 public class Thing { public Thing(String s) {} }E、 public class Thing { public void Thing() {} public Thing(String s) {} }
考题
A JavaBeans component has the following field: 11. private boolean enabled; Which two pairs of method declarations follow the JavaBeans standard for accessing this field?()A、 public void setEnabled( boolean enabled) public boolean getEnabled()B、 public void setEnabled( boolean enabled) public void isEnabled()C、 public void setEnabled( boolean enabled) public boolean isEnabled()D、 public boolean setEnabled( boolean enabled) public boolean getEnabled()
考题
下列代码正确的是哪项?() A、 public class Session implements Runnable, Clonable{ public void run ();public Object clone () ; }B、 public class Session extends Runnable, Cloneable { public void run() {/*dosomething*/} public Object clone() {/*make a copy*/} }C、 public abstract class Session implements Runnable, Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }D、 public class Session implements Runnable, implements Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }
考题
class One { public One foo() { return this; } } class Two extends One { public One foo() { return this; } } class Three extends Two { // insert method here } Which two methods, inserted individually, correctly complete the Three class?()A、 public void foo() { }B、 public int foo() { return 3; }C、 public Two foo() { return this; }D、 public One foo() { return this; }E、 public Object foo() { return this; }
考题
public class Score implements Comparable { private int wins, losses; public Score(int w, int 1) { wins = w; losses = 1; } public int getWins() { return wins; } public int getLosses() { return losses; } public String toString() { return ““ + wins + “,“ + losses + “”; } // insert code here } Which method will complete this class?() A、 public int compareTo(Object o) {/*mode code here*/}B、 public int compareTo(Score other) {/*more code here*/}C、 public int compare(Score s1,Score s2){/*more code here*/}D、 public int compare(Object o1,Object o2){/*more code here*/}
考题
Which the two demonstrate an “is a” relationship?()A、 public interface Person {} Public class Employee extends Person {}B、 public interface Shape {} public interface Rectangle extends Shape {}C、 public interface Color {} public class Shape { private Color color; }D、 public class Species {} public class Animal { private Species species; }E、 interface Component {} Class Container implements Component {private Component [] children;
考题
Which two demonstrate an “is a” relationship?() A、 public interface Person { } public class Employee extends Person { }B、 public interface Shape { } public class Employee extends Shape { }C、 public interface Color { } public class Employee extends Color { }D、 public class Species { } public class Animal (private Species species;)E、 interface Component { } Class Container implements Component ( Private Component[ ]children; )
考题
1. class super { 2. public float getNum() {return 3.0f;} 3. } 4. 5. public class Sub extends Super { 6. 7. } Which method, placed at line 6, will cause a compiler error?() A、 Public float getNum() {return 4.0f; }B、 Public void getNum () { }C、 Public void getNum (double d) { }D、 Public double getNum (float d) {retrun 4.0f; }
考题
Given an ActionEvent, which method allows you to identify the affected Component?() A、 Public class getClass()B、 Public Object getSource()C、 Public Component getSource()D、 Public Component getTarget()E、 Public Component getComponent()F、 Public Component getTargetComponent()
考题
Given the ActionEvent, which method allows you to identify the affected component?()A、 GetClass.B、 GetTarget.C、 GetSource.D、 GetComponent.E、 GetTargetComponent.
考题
多选题Which two demonstrate an “is a” relationship?()Apublic interface Person { } public class Employee extends Person { }Bpublic interface Shape { } public class Employee extends Shape { }Cpublic interface Color { } public class Employee extends Color { }Dpublic class Species { } public class Animal (private Species species;)Einterface Component { } Class Container implements Component ( Private Component[ ]children; )
考题
单选题Given the ActionEvent, which method allows you to identify the affected component?()A
GetClass.B
GetTarget.C
GetSource.D
GetComponent.E
GetTargetComponent.
考题
单选题Which method must be defined by a class implementing the java.lang.Runnable interface? ()A
void run()B
public void run()C
public void start()D
void run(int priority)E
public void run(int priority)F
public void start(int priority)
考题
单选题class super { public float getNum() {return 3.0f;} } public class Sub extends Super { } Which method, placed at line 6, will cause a compiler error?()A
Public float getNum() {return 4.0f; }B
Public void getNum (){}C
Public void getNum (double d){}D
Public double getNum (float d) {retrun 4.0f; }
考题
单选题下列代码正确的是哪项?()A
public class Session implements Runnable, Clonable{ public void run ();public Object clone () ; }B
public class Session extends Runnable, Cloneable { public void run() {/*dosomething*/} public Object clone() {/*make a copy*/} }C
public abstract class Session implements Runnable, Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }D
public class Session implements Runnable, implements Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }
考题
多选题A JavaBeans component has the following field: 11. private boolean enabled; Which two pairs of method declarations follow the JavaBeans standard for accessing this field?()Apublic void setEnabled( boolean enabled) public boolean getEnabled()Bpublic void setEnabled( boolean enabled) public void isEnabled()Cpublic void setEnabled( boolean enabled) public boolean isEnabled()Dpublic boolean setEnabled( boolean enabled) public boolean getEnabled()
考题
多选题Which the two demonstrate an “is a” relationship?()Apublic interface Person {} Public class Employee extends Person {}Bpublic interface Shape {} public interface Rectangle extends Shape {}Cpublic interface Color {} public class Shape { private Color color; }Dpublic class Species {} public class Animal { private Species species; }Einterface Component {} Class Container implements Component {private Component [] children;
考题
单选题public class Score implements Comparable { private int wins, losses; public Score(int w, int 1) { wins = w; losses = 1; } public int getWins() { return wins; } public int getLosses() { return losses; } public String toString() { return “”; } // insert code here } Which method will complete this class?()A
public int compareTo(Object o) {/*mode code here*/}B
public int compareTo(Score other) {/*more code here*/}C
public int compare(Score s1,Score s2){/*more code here*/}D
public int compare(Object o1,Object o2){/*more code here*/}
考题
多选题Which three demonstrate an “is a” relationship?()Apublic class X { } public class Y extends X { }Bpublic interface Shape { } public interface Rectangle extends Shape{ }Cpublic interface Color { } public class Shape { private Color color; }Dpublic interface Species { } public class Animal { private Species species; }Epublic class Person { } public class Employee { public Employee(Person person) { }Finterface Component { } class Container implements Component { private Component[] children; }
考题
单选题Given an ActionEvent, which method allows you to identify the affected Component?()A
Public class getClass()B
Public Object getSource()C
Public Component getSource()D
Public Component getTarget()E
Public Component getComponent()F
Public Component getTargetComponent()
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