String foo = “blue”；
Booleanbar = new Boolean [1]；
if （bar[0]） {
foo = “green”；
}
What is the result？（）
A. Foo has the value of “”
B. Foo has the value of null.
C. Foo has the value of “blue”
D. Foo has the value of “green”
E. An exception is thrown.
F. The code will not compile.
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A. Char ch = “a”；
B. Char ch = ‘“‘ ‘；
C. Char ch = ‘cafe‘；
D. Char ch = “cafe”；
E. Char ch = ‘“ucafe‘；
F. Char ch = ‘“u10100‘；
G. Char ch = （char） true；
Given： 310-025
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- 48 -
public class foo {
static String s；
public static void main （Stringargs） {
system.out.printIn （“s=” + s）；
}
}
What is the result？（）
A. The code compiles and “s=” is printed.
B. The code compiles and “s=null” is printed.
C. The code does not compile because string s is not initialized.
D. The code does not compile because string s cannot be referenced.
E. The code compiles， but a NullPointerException is thrown when toString is called.
public interface Foo{
int k = 4；
}
Which three are equivalent to line 2？ （）
A. Final int k = 4；
B. Public int k = 4；
C. Static int k = 4；
D. Private int k = 4；
E. Abstract int k = 4；
F. Volatile int k = 4；
G. Transient int k = 4；
H. Protected int k = 4；
int index = 1；
String test = new String；
String foo = test[index]；
What is the result？（）
A. Foo has the value “”
B. Foo has the value null
C. An exception is thrown
D. The code will not compile
public class Test {
public static void main （Stringargs） {
String foo = args[1]；
String bar = args；
String baz = args；
System.out.printIn（“baz = ” + baz）；
}
}
And the output： Baz = 2
Which command line invocation will produce the output？（）
A. Java Test 2222
B. Java Test 1 2 3 4
C. Java Test 4 2 4 2
D. Java Test 4 3 2 1
package foo；
import java.util.Vector；
private class MyVector extends Vector {
int i = 1；
public MyVector（） {
i = 2；
}
}
public class MyNewVector extends MyVector {
public MyNewVector （） {
i = 4；
}
public static void main （String args ） {
MyVector v = new MyNewVector（）；
}
}
The file MyNewVector.java is shown in the exhibit. What is the result？（）
A. Compilation will succeed.
B. Compilation will fail at line 5.
C. Compilation will fail at line 6.
D. Compilation will fail at line 14.
E. Compilation will fail at line 17.
A. false
B. default
C. _object
D. a-class
A. New BufferedInputStream（“in.txt”）；
B. New BufferedInputStream（new File（“in.txt”））；
C. New BufferedInputStream（Writer（“in.txt”））；
D. New BufferedInputStream（new Writer（“in.txt”））；
E. New BufferedInputStream（new InputStream（“in.txt”））；
F. New BufferedInputStream（new FileInputStream（“in.txt”））；
A. OutputStream out=new FileOutputStream（“file.txt”）；
B. OutputStream out=new FileOutputStream（“file.txt”， “append”）；
C. FileOutputStream out=new FileOutputStream（“file.txt”， true）；
D. FileOutputStream out=new FileOutputStream（new file（“file.txt”））；
E. OutputStream out=new FileOutputStream（new File（“file.txt”）true）；
A. InputStream in=new FileReader（“file.txt”）；
B. InputStream in=new FileInputStream（“file.txt”）；
C. InputStream in=new InputStreamFileReader （“file.txt”， “read”）；
D. FileInputStream in=new FileReader（new File（“file.txt”））；
E. FileInputStream in=new FileInputStream（new File（“file.txt”））；
最新试题
What is the result？（）
What is the result？（）
Which code， inserted at line 4， guarantees that this program will output [1， 2]？（）
Which two statements are true？（）
Which three will compile and run without exception？（）
Given： foo and bar are public references available to many other threads， foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， what provides the most reliable way to ensure that foo will stop executing wait（）？（）
Which statement is true？（）
What is the result？（）
What is the result？（）
Which two are possible results？（）