java_JAVA面试题专辑.pdf

JAVA 100 Math random 0 1 double JAVA JAVA Java JAVA SOCKET 伯 JAVA Hello This is a test text text test a is This Hello Java 伯 try catch finally try catch finally JAVA abstract class abstract interface static final STRING STRINGBUFFER STRING STRINGBUFFER StringBuffer String StringBuffer toString final finally final final final final final finally finally catch finally Collection Collections Collections java util Collection java util GC GC Garbage Collection GC Java Math round 11 5 Math round 11 5 Math round 11 5 12 Math round 11 5 11 Java goto Goto java java length String length length length String length Overload Override Overloaded Overriding Overloading Overloaded runtime exception IndexOutOfBoundsException ClassCastException error exception error exception run start Start Constructor override Constructor Override Overload String String final swtich byte long String switch expr1 expr1 switch case int short char byte long string swtich vector Vector JAVA java io Serializable public private protected package package public protected friendly private friendly ArrayList Vector ArrayList Vector Vector ArrayList Vector ArrayList char java unicode char 16 Thread Runnable synchronized package test public class FatherClass public FatherClass System out println FatherClass Create package test import test FatherClass public class ChildClass extends FatherClass public ChildClass System out println ChildClass Create public static void main String args FatherClass fc new FatherClass ChildClass cc new ChildClass C java test ChildClass FatherClass Create FatherClass Create ChildClass Create 6 package test public class OuterClass private class InterClass public InterClass System out println InterClass Create public OuterClass InterClass ic new InterClass System out println OuterClass Create public static void main String args OuterClass oc new OuterClass C java test OuterClass InterClass Create OuterClass Create float float f 3 4 float f float 3 4 JAVA Collection FrameWork Collection FrameWork Collection List LinkedList ArrayList Vector 伯 Stack Set Map Hashtable HashMap WeakHashMap Collection Collection Object Collection Elements Map key value class A public static void main String args String str for int i 0 i 100 i str char i System out println str Java 1 Java String 2 abc cba bbbwlirbbb bbbhhtccc 3 Integer Double 4 1970 5 6 I O 7 Java 8 GB2312 ISO 8859 1 9 Java Statement PreparedStatement 10 JSP 4 100 5 java 2 10 3 50 78 22 34 30 65 6 7 2 oo 1 2 3 120 8 VC CforSCOUNIX Java AtmConfig txt 4 IP 16 20 10 1001192 168 168 1 1002192 168 168 2 1003192 168 168 3 1004192 168 168 4 n ATM IP AtmConfig n ATM AtmCinfig n JSP Swing 4 IP IP Java ATM d atm etc AtmConfig txt 9 1 public class Test2 extends Test1 System out print 1 Test2 System out print 2 static System out print 3 System out print 4 public static void main String args new Test2 class Test1 Test1 System out print 5 static System out print 6 2 public class Test3 extends Test4 int i 30 Test3 print i 40 public static void main String args System out println new Test3 i void print System out println i class Test4 int i 10 Test4 print i 20 void print System out println i 10 15 interface A int x 0 class B int x 1 class C extends B implements A public void pX System out println x public static void main String args new C pX 11 public String toString return this this hashCode toString toString Java final finally finalize final final abstract final final final final finally finally catch finally finalize Java finalize Object finalize finalize Anonymous Inner Class extends implements interface extends Static Nested Class Inner Class Nested Class C Inner Class JAVA Java C http throws an AssertionError if a 0 assert Expression1 assert Expression1 Expression2 Expression1 Expression2 String source 1 4 javac source 1 4 Test java enableassertions ea da disableassertions esa dsa GC GC GC Java System gc Runtime getRuntime gc String s new String xyz String Object xyx xyx s Math round 11 5 Math round 11 5 Math round 11 5 long 12 Math round 11 5 long 11 short s1 1 s1 s1 1 short s1 1 s1 1 short s1 1 s1 s1 1 s1 short s1 1 int short s1 short s1 1 short s1 1 s1 1 sleep wait sleep sleep a b wait x wait Java goto Goto java java length String length length length String length Overload Override Overloaded Overriding Overloading Java Overriding Overloading Overriding Overloading Overloaded Set equals Set iterator equals Set equals equals runtime exception ArithmeticException ArrayStoreException BufferOverflowException BufferUnderflowException CannotRedoException CannotUndoException ClassCastException CMMException ConcurrentModificationException DOMException EmptyStackException IllegalArgumentException IllegalMonitorStateException IllegalPathStateException IllegalStateException ImagingOpException IndexOutOfBoundsException MissingResourceException NegativeArraySizeException NoSuchElementException NullPointerException ProfileDataException ProviderException RasterFormatException SecurityException SystemException UndeclaredThrowableException UnmodifiableSetException UnsupportedOperationException error exception error exception List Set Map Collection List Set Map abstract class interface abstract class abstract Abstract interface static final instanceof abstract method static native synchronized implements concrete class implements run start start JVM run Constructor override Constructor Overriding Overloading String String final synchronized synchronized try return try finally code return return 2 8 C 2 3 x equals y true hash code hash code Java swtich byte long String switch expr1 expr1 switch case int short char byte long string swtich Singleton Singleton Java Class Singleton private static private public getInstance public class Singleton private Singleton private private static Singleton instance new Singleton class 伯 伯 public static Singleton getInstance return instance 伯 伯 public class Singleton private static Singleton instance null public static synchronized Singleton getInstance 伯 伯 伯 if instance null instance new Singleton return instance 伯 伯 private static WEB SERVER 伯 JAVA SERVLET API forward sendRedirect forward redirect forward sendRedirect STRUTS STRUTS Struts MVC Struts Controller ActionServlet ActionMapping Action Action ActionForm Bean Action Controller Controller Struts Java Servlet JavaServer Pages Web framework Struts MVC Model View Controller Struts controller servlet Action JSP tag controller servlet XML Java reflection APIs JavaBeans MVC MVC Model View Controller Model JavaBean EJB View JSP Controller Servlet html a jsp age 100 0 xx a jsp Exception jsp If isTrue Response sendRedi