当前分类: SCJP程序员认证考试
问题:多选题Given that b and c refer to instances of wrapper classes, which two statements are true?()Ab.equals(b) returns true.Bb.equals(c) returns the same result as b == c.Cb.eqials(c) can return false even if c.equals(b) returns true.Db.equals(c) throws an exc...
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问题:单选题public class Score implements Comparable { private int wins, losses; public Score(int w, int 1) { wins = w; losses = 1; } public int getWins() { return wins; } public int getLosses() { return losses; } public String toString() { return “”; } // ...
问题:单选题int x=0; int y 10; do { y--; ++x; } while (x 5); System.out.print(x + “,“ + y); What is the result?()A 5,6B 5,5C 6,5D 6,6...
问题:单选题public class X implements Runnable( private int x; private int y; public static void main(Stringargs) X that = new X(); (new Thread(that)).start(); (new Thread(that)).start(); ) public void run() ( for (;;) ( x++; y++; System.out.pri...
问题:单选题What will be written to the standard output when the following program is run?() public class Q03e4 { public static void main(String args[]) { String space = " "; String composite = space + "hello" + space + space; composite.concat("world"); ...
问题:int i = 0; while (true) { if(i==4) { break; } ++i; } S...
问题:单选题package geometry; public class Hypotenuse { public InnerTriangle it = new InnerTriangle(); class InnerTriangle { public int base; public int height; } } Which is true about the class of an object that can reference the variable base? ()A It ca...
问题:多选题11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12?()AfinalBstaticCnativeDpublicEprivateFabstractGprotected...
问题:填空题3. string foo = “ABCDE”; 4. foo.substring(3); 5. foo.concat(“XYZ”); 6. Type the value of foo at line 6.()...
问题:单选题class One { public One() { System.out.print(1); } } class Two extends One { public Two() { System.out.print(2); } } class Three extends Two { public Three() { System.out.print(3); } } public class Numbers{ public static void main( String[] ar...
问题:Given the ActionEvent, which method allows you to identify t...
问题:Which two declarations prevent the overriding of a method? (...
问题:多选题Which of these are keywords in Java?()AdefaultBNULLCStringDthrowsElong...
问题:单选题Which determines if “prefs” is a directory and exists on the file system?()A Boolean exists=Directory.exists (“prefs”);B Boolean exists=(new File(“prefs”)).isDir();C Boolean exists=(new Directory(“prefs”)).exists();D Boolean exists=(new File(“prefs...
问题:单选题1. public class ForBar { 2. public static void main(String []args) { 3. int i = 0, j = 5; 4. tp: for (;;) { 5. i ++; 6. for(;;) 7. if(i --j) break tp; 8. } 9. system.out.printIn(“i = ” + i + “, j = “+ j); 10. } 11. } What is the resu...
问题:单选题Runnable r = new Runnable() { public void run() { System.out.print(”Cat”); } }; Threadt=new Thread(r) { public void run() { System.out.print(”Dog”); } }; t.start(); What is the result?()A CatB DogC Compilation fails.D The code runs with ...
问题:单选题Which gets the name of the parent directory file “file.txt”?()A String name= File.getParentName(“file.txt”);B String name= (new File(“file.txt”)).getParent();C String name = (new File(“file.txt”)).getParentName();D String name= (new File(“file.txt”...
问题:单选题public class X { public object m () { object o = new float (3.14F); object oa = new object [1]; oa[0]= o; o = null; oa[0] = null; return o; } } When is the float object created in line 3, eligible for garbage collection?()A Just af...
问题:单选题Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?() class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void...
问题:public class X { public static void main(String [] args) { ...