当前分类: SCJP程序员认证考试
问题:When comparing java.io.BufferedWriter to java.io.FileWriter,...
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问题:单选题The file “file.txt” exists on the file system and contsins ASCII text. Given: try { File f = new File(“file.txt”); OutputStream out = new FileOutputStream(f, true); } catch (IOException) {} What is the result?()A The code does not compi...
问题:public class TestSeven extends Thread { private static int ...
问题:单选题package test1; public class Test1 { static int x = 42; } package test2; public class Test2 extends test1.Test1 { public static void main(String[] args) { System.out.println(“x = “ + x); } } What is the result?()A x = 0B x = 42C Compilation ...
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:多选题Choose the three valid identifiers from those listed below.()AI Do Like The Long Name ClassB$byteCconstD_okE3_case...
问题:多选题Which three are valid declarations of a float? ()AFloat foo = -1;BFloat foo = 1.0;CFloat foo = 42e1;DFloat foo = 2.02f;EFloat foo = 3.03d;FFloat foo = 0x0123;...
问题:int i = 0; while (true) { if(i==4) { break; } ++i; } S...
问题:Which two statements are true about the hashCode method?()...
问题:多选题11. public interface Status { 12. /* insert code here */ int MY_VALUE = 10; 13. } Which three are valid on line 12?()AfinalBstaticCnativeDpublicEprivateFabstractGprotected...
问题:Which two are reserved words in the Java programming languag...
问题:单选题1. public class ForBar { 2. public static void main(String []args) { 3. int i = 0, j = 5; 4. tp: for (;;) { 5. i ++; 6. for(;;) 7. if(i --j) break tp; 8. } 9. system.out.printIn(“i = ” + i + “, j = “+ j); 10. } 11. } What is the resu...
问题:多选题Which of these are keywords in Java?()AdefaultBNULLCStringDthrowsElong...
问题:多选题public class MethodOver { private int x, y; private float z; public void setVar(int a, int b, float c){ x = a; y = b; z = c; } } Which two overload the setVar method?()Avoid setVar (int a, int b, float c){ x = a; y = b; z = c; }Bpublic void s...
问题:public class X { public static void main(String [] args) { ...
问题:单选题Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?() class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void...
问题:多选题Which are valid identifiers?()A_classB$value$Czer@D¥ngstrE2muchuq...
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:填空题3. string foo = “ABCDE”; 4. foo.substring(3); 5. foo.concat(“XYZ”); 6. Type the value of foo at line 6.()...