当前分类: SCJP程序员认证考试
问题:多选题Given two collection objects referenced by col1 and col2,which of these statements are true?()AThe operation col1.retainAll(col2) will not modify the col1 object.BThe operation col1.removeAll(col2) will not modify the col2 object.CThe operation col1.ad...
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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int i = 0; while (true) { if(i==4) { break; } ++i; } System.out.println(“i=”+i); What is the result?()A i = 0B i = 3C i = 4D i = 5E Compilation fails....
问题:多选题Which of these are keywords in Java?()AdefaultBNULLCStringDthrowsElong...
问题:单选题public static void search(List list) { list.clear(); list.add(”b”); list.add(”a”); list.add(”c”); System.out.println(Collections.binarySearch(list, “a”)); } What is the result of calling search with a valid List implementation?()A 0B 1C aD bE cF...
问题:单选题Given an ActionEvent, which method allows you to identify the affected Component?()A Public class getClass()B Public Object getSource()C Public Component getSource()D Public Component getTarget()E Public Component getComponent()F Public Component...
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:int i = 0; while (true) { if(i==4) { break; } ++i; } S...
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:多选题public class MethodOver { private int x, y; private float z; public void setVar(int a, int b, float c){ x = a; y = b; z = c; } } Which two overload the setVar method?()Avoid setVar (int a, int b, float c){ x = a; y = b; z = c; }Bpublic void s...
问题:public class X implements Runnable( private int x; priv...
问题:public class Test { public static void main(String [] args)...
问题:What will be written to the standard output when the followi...
问题:1. class Pizza { 2. java.util.ArrayList toppings; 3. publi...
问题:public class X { public static void main(String [] args) { ...
问题:单选题class Foo { private int x; publicFoo(intx) {this.x=x; } public void setX( int x) { this.x = x; } public int getX() { return x; } } public class Gamma { static Foo fooBar( Foo foo) { foo = new Foo( 100); return foo; } public static void main...
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: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Which declaration prevents creating a subclass of an outer class?()A Static class FooBar{}B Private class FooBar{}C Abstract public class FooBar{}D Final public class FooBar{}E Final abstract class FooBar{}...