1. public class Target {  2. private int i = 0；  3. public int addOne（） {  4. return ++i；  5. }  6. }  And：  1. public class Client {  2. public static void main（String[] args） {  3. System.out.println（new Target（）.addOne（））；  4. }  5. }  Which change can you make to Target without affecting Client？（） 

A、 Line 4 of class Target can be changed to return i++；

B、 Line 2 of class Target can be changed to private int i = 1；

C、 Line 3 of class Target can be changed to private int addOne（） {

D、 Line 2 of class Target can be changed to private Integer i = 0；

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  B、 Only the assert statement on line 31 is used appropriately.

  C、 The assert statements on lines 29 and 31 are used appropriately.

  D、 The assert statements on lines 26 and 29 are used appropriately.

  E、 The assert statements on lines 29 and 33 are used appropriately.

  F、 The assert statements on lines 29， 31， and 33 are used appropriately.

  G、 The assert statements on lines 26， 29， and 31 are used appropriately.

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• 33. Date d = new Date（0）；  34. String ds = “December 15， 2004”；  35. // insert code here  36. try {  37. d = df.parse（ds）；  38. }  39. catch（ParseException e） {  40. System.out.println（”Unable to parse “+ ds）；  41. }  42. // insert code here too  Which will create the appropriate DateFormat object and add a day to the Date object？（） 

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• 数字签名功能不包括(42)。

  A．防止发送方的抵赖行为

  B．发送方身份确认

  C．接收方身份确认

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• import java.awt.*；   public class Test extends Frame {   public Test（） {   add（new Label（“Hello”） ）；   add（new TextField（“Hello”） ）；   add（new Button（“Hello”） ）；   pack（）；   show（）；    }   public static void main（String args） {   new Test （）；   }   }   What is the result？ （） 

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  B、 A Window will appear containing only a Button.

  C、 An IllegalArgumentException is thrown at line 6.

  D、 A Window button will appear but will not contain the Label， TextField， or Button.

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• public class SyncTest {  private int x；   private int y；   public synchronized void setX （int i） （x=1；）   public synchronized void setY （int i） （y=1；）   public synchronized void setXY（int 1）（set X（i）； setY（i）；）   public synchronized Boolean check（） （return x !=y；）   }   Under which conditions will check （） return true when called from a different class？ 

  A、 Check（） can never return true.

  B、 Check（） can return true when setXY is called by multiple threads.

  C、 Check（） can return true when multiple threads call setX and setY separately.

  D、 Check（） can only return true if SyncTest is changed to allow x and y to be set separately.

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