A. New dataInputStream(“in.txt”);
B. New dataInputStream(new file(“in.txt”));
C. New dataInputStream(new writer(“in.txt”));
D. New dataInputStream(new FileWriter(“in.txt”));
E. New dataInputStream(new InputStream(“in.txt”));
F. New dataInputStream(new FileInputStream(“in.txt”));
您可能感兴趣的试卷
你可能感兴趣的试题
public class Foo implements Runnable (
public void run (Thread t) {
system.out.printIn(“Running.”);
}
public static void main (String args) {
new thread (new Foo()).start();
}
)
What is the result?()
A. An exception is thrown.
B. The program exists without printing anything.
C. An error at line 1 causes compilation to fail.
D. An error at line 6 causes the compilation to fail.
E. “Running” is printed and the program exits.
A. Exiting from a synchronized block.
B. Calling the wait method on an object.
C. Calling the notify method on an object.
D. Calling the notifyAll method on an object.
E. Calling the setPriority method on a thread object.
public class ForBar {
public static void main(String args) {
int i = 0, j = 5;
tp: for (;;) {
i ++;
for(;;)
if(i > --j) break tp;
}
system.out.printIn(“i = ” + i + “, j = “+ j);
}
}
What is the result? ()
A. The program runs and prints “i=1, j=0”
B. The program runs and prints “i=1, j=4”
C. The program runs and prints “i=3, j=4”
D. The program runs and prints “i=3, j=0”
E. An error at line 4 causes compilation to fail.
F. An error at line 7 causes compilation to fail.
A. Error
B. Event
C. Object
D. Exception
E. Throwable
F. RuntimeException
public class SwitchTest {
public static void main (String args) {
System.out.PrintIn(“value =” +switchIt(4));
}
public static int switchIt(int x) {
int j = 1;
switch (x) {
case 1: j++;
case 2: j++;
case 3: j++;
case 4: j++;
case 5: j++;
default:j++;
}
return j + x;
}
}
What is the output from line 3? ()
A. Value = 3
B. Value = 4
C. Value = 5
D. Value = 6
E. Value = 7
F. Value = 8
public class ExceptionTest {
class TestException extends Exception {}
public void runTest () throws TestException {}
public void test () /* Point X*/ {
runTest ();
}
}
At point X on line 4, which code can be added to make the code compile?()
A. Throws Exception.
B. Catch (Exception e).
C. Throws RuntimeException.
D. Catch (TestException e).
E. No code is necessary.
A. int ia = new int [15];
B. float fa = new float [20];
C. char ca = “Some String”;
D. Object oa = new float[20];
E. Int ia = (4, 5, 6) (1, 2, 3)
public class Test {
public static void main (String args) {
class Foo {
public int i = 3;
}
Object o = (Object) new Foo();
Foo foo = (Foo)o;
System.out.printIn(foo. i);
}
}
What is the result?()
A. Compilation will fail.
B. Compilation will succeed and the program will print “3”
C. Compilation will succeed but the program will throw a ClassCastException at line 6.
D. Compilation will succeed but the program will throw a ClassCastException at line 7.
A. Final void methoda(){}
B. Void final methoda(){}
C. Static void methoda(){}
D. Static final void methoda(){}
E. Final abstract void methoda(){}
public class OuterClass {
private double d1 1.0;
//insert code here
}
You need to insert an inner class declaration at line2. Which two inner class declarations are valid?()
A. static class InnerOne { public double methoda() {return d1;} }
B. static class InnerOne { static double methoda() {return d1;} }
C. private class InnerOne { public double methoda() {return d1;} }
D. protected class InnerOne { static double methoda() {return d1;} }
E. public abstract class InnerOne { public abstract double methoda(); }
最新试题
Which three will compile and run without exception?()
Given that Triangle implements Runnable, and:Which two statements, inserted independently at both lines 35 and 41, tend to allow both threads to temporarily pause and allow the other thread to execute?()
What is the result?()
Which statement is true?()
Which code, inserted at line 4, guarantees that this program will output [1, 2]?()
What is the result?()
Which two of statements are true?()
What is the result?()
What is the result?()
What is the appropriate definition of the hashCode method in class Person?()