Given:
What is the result when the go() method is invoked?()
A.00
B.0001
C.000120
D.00012021
E.Compilation fails
F.An exception is thrown at runtime
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Given:
Which code, inserted at line 16, will cause a java.lang.ClassCastException?()
A.Alpha a = x;
B.Foo f = (Delta)x;
C.Foo f = (Alpha)x;
D.Beta b = (Beta)(Alpha)x;
Given:
What is the result?()
A.2
B.3
C.12
D.23
Click the Exhibit button.
Which code, inserted at line 14, will allow this class to correctly serialize and deserialize?()
A.s.defaultReadObject();
B.this = s.defaultReadObject();
C.y = s.readInt(); x = s.readInt();
D.x = s.readInt(); y = s.readInt();
Given:
22.StringBuilder sb1 = new StringBuilder("123");
23.String s1 = "123";
24.// insert code here
25.System.out.println(sb1 + " " + s1);
Which code fragment, inserted at line 24, outputs "123abc 123abc"?()
A.sb1.append("abc"); s1.append("abc");
B.sb1.append("abc"); s1.concat("abc");
C.sb1.concat("abc"); s1.append("abc");
D.sb1.concat("abc"); s1.concat("abc");
E.sb1.append("abc"); s1 = s1.concat("abc");
Given:
Which method will complete this class?()
A.public int compareTo(Object o){/*more 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*/}
Given:
What is the result?()
A.test end
B.Compilation fails.
C.test runtime end
D.test exception end
E.A Throwable is thrown by main at runtime.
Given that the current directory is empty, and that the user has read and write permissions, and thefollowing:
Which statement is true?()
A.Compilation fails.
B.The file system has a new empty directory named dir.
C.The file system has a new empty directory named newDir.
D.The file system has a directory named dir, containing a file f1.txt.
E.The file system has a directory named newDir, containing a file f1.txt.
A.Closing an open stream.
B.Flushing an open stream.
C.Writing to an open stream.
D.Writing a line separator to an open stream.
Given:
What is the output?()
A.42
B.420
C.462
D.42042
Given:
11.double input = 314159.26;
12.NumberFormat nf = NumberFormat.getInstance(Locale.ITALIAN);
13.String b;
14.//insert code here
Which code, inserted at line 14, sets the value of b to 314.159,26?()
A.b = nf.parse( input );
B.b = nf.format( input );
C.b = nf.equals( input );
D.b = nf.parseObject( input );
最新试题
Given a method that must ensure that its parameter is not null:What, inserted at line 12, is the appropriate way to handle a null value?()
Given:What is the result?()
Click the Exhibit button.Which graph represents the correct directory structure for a JAR file from which those classes can be used by the compiler and JVM?()
Given:What is the result?()
Given:What is the result?()
Given:A programmer is developing a class Key, that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key?()
Click the Exhibit button.What two must the programmer do to correct the compilation errors?()
Given:What is the result?()
Given:What is the result?()
Given:Which two code fragments, inserted independently at line 13, will compile?()