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What is the target variable in an Event?
- the Object() where the event came from,
- the Object() where the event is destined for,
- what the Object() that generated the event was doing,
What is the statement to assign a unicode constant CODE with 0x30a0?
The following code resides in the source?
class StringTest {
public static void main( String [] agrs) {
//
// String comparing
//
String a,b;
StringBuffer c,d;
c = new StringBuffer("Hello");
a = new String("Hello");
b = a;
d = c;
if ( <<<operator>>> ) { }
}
} //class |
Which of the following statement return true for the <<>> line in StringTest.class?
- b.equals(a)
- b==a
- d==c
- d.equals(c)
Which are valid identifiers?
- %fred
- *fred
- thisfred
- 2fred
- fred
We have the following class X,
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public class X { public void method(); } <<<STATEMENTS>>>
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Which of the following statement return true for the <<>> line in StringTest.class?
- abstract void method();
- class Y extends X { }
- package java.util;
- abstract class Z { }
Which code fragements would correctly identify the number of arguments passed via command line to a Java Application?
- int count = args.length;
- int count = 0; while args[count] !=null) count++;
- int count = 0;while (!(args[count].equals(""))) count++;
- int count = args.length - 1;
FilterOutputStream is the parent class for BufferedOutputStream, DataOutputStream and PrintStream.
Which classes are valid argument for the constructor of a FilterOutputStream?
- InputStream
- OutputStream
- File
- RandomAccessFile
- StreamTokenizer
Given the following method body:
1:
2:{
3: if (unsafe()) {
4: unsafe();
5: }
6: else {
7: safe();
7: }
8:}
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The method “unsafe” might throw an AWTException (which is not a subclass of RunTimeException).
Which correctly completes the method of declaration when added at line one(1:)?
- public AWTException methodName()
- public void methodName()
- public void methodName() throws AWTException
- public void methodName() throw AWTException
- public void methodName() throws Exception
Given a TextField and is constructed like this:
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TextField = new TextField(30);
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- The displayed width is 30 columns.
- The displayed string can use multiple fonts.
- The user will be able to edit the character string.
- The displayed line will show exactly thirthy characters.
- The maximum of characters in a line will be thirthy.
Given this skeleton of a class currently under construction:
public class Example {
int x, y;
public Example( int a) {
//lots of complex computation
x=a;
}
public Example( int a, int b) {
//do everythinf the same as single argument
// including assignment x=a
y=b;
}
}
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What is the most concise way to code the “do everything the same as single argument?
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