问题:多选题Given: And MainClass exists in the /apps/com/company/application directory. Assume the CLASSPATH environment variable is set to "." (current directory). Which two java commands entered at the commandline will run MainClass?()Ajava MainClass if run from the /apps directoryBjava com.company.application.MainClass if run from the /apps directoryCjava -classpath /apps com.company.application.MainClass if run from any directoryDjava -classpath . MainClass if run from the /apps/com/company/application directoryEjava -classpath /apps/com/company/application:. MainClass if run from the /apps directory
Sunday, February 18, 2024
问题:多选题Which two code fragments will execute the method doStuff() in a separate thread?()Anew Thread() {public void run() { doStuff(); }};Bnew Thread() {public void start() { doStuff(); }};Cnew Thread() {public void start() { doStuff(); }}.run();Dnew Thread() {public void run() { doStuff(); }}.start();Enew Thread(new Runnable() {public void run() { doStuff(); }}).start();
Sunday, March 17, 2024
问题:单选题Given: 11.String test = "This is a test"; 12.String[] tokens = test.split("/s"); 13.System.out.println(tokens.length); What is the result?()A 0B 1C 4D Compilation fails.
Saturday, July 1, 2023
问题:单选题Which Man clsss properly represents the relationship "Man has a best friend who is a Dog"?()A class Man extends Dog { }B class Man implements Dog { }C class Man { private BestFriend dog; }D class Man { private Dog bestFriend; }E class Man { private Dog; }F class Man { private BestFriend; }
问题:单选题Given: 12.Date date = new Date(); 13.df.setLocale(Locale.ITALY); 14.String s = df.format(date); The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14, 2000?()A The value of s is 14-dic-2000.B The value of s is Dec 14, 2000.C An exception is thrown at runtime.D Compilation fails because of an error in line 13.
Saturday, April 27, 2024
问题:单选题Given: What is the result?()ACompilation fails.BAn exception is thrown at runtime.CdoStuff x = 6 main x = 6DdoStuff x = 6 main x = 7EdoStuff x = 7 main x = 6
问题:单选题Given: 1.package test; 2. 3.class Target { 4.public String name = "hello";5.} What can directly access and change the value of the variable name?()A any classB only the Target classC any class in the test packageD any class that extends Target
Wednesday, April 24, 2024
问题:多选题Given a class whose instances, when found in a collection of objects, are sorted by using the compare To method, which two statements are true?()AThe class implements java.lang.Comparable.BThe class implements java.util.Comparator.CThe interface used to implement sorting allows this class to define only one sort sequence.DThe interface used to implement sorting allows this class to define many different sort sequences.
问题:单选题Given: What is the result?()ACompilation succeeds.BCompilation fails due to multiple errors.CCompilation fails due to an error only on line 20.DCompilation fails due to an error only on line 21.ECompilation fails due to an error only on line 22.
问题:单选题Given: What is the result?()AHelloBHello WorldCCompilation fails.DHello World 5EThe code runs with no output.
问题:单选题Given: What is the result?()Ab 3Bb 8Cb 13Df 3
问题:多选题Given: class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and: ClassA p0 = new ClassA(); ClassB p1 = new ClassB(); ClassC p2 = new ClassC(); ClassA p3 = new ClassB(); ClassA p4 = new ClassC(); Which three are valid?()Ap0 = p1;Bp1 = p2;Cp2 = p4;Dp2 = (ClassC)p1;Ep1 = (ClassB)p3;Fp2 = (ClassC)p4;
Saturday, December 30, 2023
问题:多选题Which two code fragments correctly create and initialize a static array of int elements?()Astatic final int[] a = { 100,200 };Bstatic final int[] a; static { a=new int[2]; a[0]=100; a[1]=200; }Cstatic final int[] a = new int[2]{ 100,200 };Dstatic final int[] a; static void init() { a = new int[3]; a[0]=100; a[1]=200; }
问题:多选题Which three will compile and run without exception?()Aprivate synchronized Object o;Bvoid go() {synchronized() { /* code here */ }Cpublic synchronized void go() { /* code here */ }Dprivate synchronized(this) void go() { /* code here */ }Evoid go() {synchronized(Object.class) { /* code here */ }Fvoid go() {Object o = new Object();synchronized(o) { /* code here */ }
问题:单选题Given: What is the result?()ABBThe code runs with no output.CCompilation fails because of an error in line 12.DCompilation fails because of an error in line 15.ECompilation fails because of an error in line 18.
问题:单选题Given a valid DateFormat object named df,and 16.Date d = new Date(0L); 17.String ds = "December 15, 2004"; 18.//insert code here What updates d’s value with the date represented by ds?()A 18. d = df.parse(ds);B 18. d = df.getDate(ds);C 18. try {19. d = df.parse(ds);20. } catch(ParseException e) { };D 18. try {19. d = df.getDate(ds);20. } catch(ParseException e) { };
问题:单选题Given that the elements of a PriorityQueue are ordered according to natural ordering,and: What is the result?()Aapple pearBbanana pearCapple appleDapple bananaEbanana banana
问题:多选题Which two scenarios are NOT safe to replace a StringBuffer object with a StringBuilder object?()AWhen using versions of Java technology earlier than 5.0.BWhen sharing a StringBuffer among multiple threads.CWhen using the java.io class StringBufferInputStream.DWhen you plan to reuse the StringBuffer to build more than one string.
Thursday, November 16, 2023
问题:多选题A developer is creating a class Book, that needs to access class Paper. The Paper class is deployed in a JAR named myLib.jar. Which three, taken independently, will allow the developer to use the Paper class while compiling the Bookclass?()AThe JAR file is located at $JAVA_HOME/jre/classes/myLib.jar.BThe JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar..CThe JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class.DThe JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar.EThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - cp /foo/myLib.jar/Paper Book.java.FThe JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - classpath /foo/myLib.jar Book.java