2022年大公司的Java面试题集 .pdf

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1、JavaIBM, E*Trade, Siebel, Motorola, SUN, IDE()IDEJavaHibernateEclipsecommand design patternfinal, finally, finalizefinal finallyfinalizeObjectAnonymous Inner Class () extends()implements()interface()? swingStatic Nested Class Inner Class()Static Nested Classstatic&and. HashMapHashtableHashMapHashtab

2、leMapHashMapnullkey,Hashtable. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 6 页 - - - - - - - - - Collection CollectionsCollectionSet List. Collectionsassert1.4booleanassert true,AssertionErrorassert :AssertionError-source 1.4 eaassertGC? GC? GCGabage Collect

3、ion,JavaGCJavaString s = new String(xyz);String Object? Math.round(11.5)? Math.round(-11.5)? Math.round(11.5)=12 Math.round(-11.5)=-11 round1/2floor. short s1 = 1; s1 = s1 + 1;? short s1 = 1; s1 += 1;? short s1 = 1; s1 = s1 + 1; s1+1intshort s1 = 1; s1 += 1;sleep() wait() ? sleepThreadsleepwaitObjec

4、twaitnotifynotifyAllJavagoto? 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 6 页 - - - - - - - - - length()? Stringlength()length()lengthStringlength()OverloadOverrideOverloaded? OverridingOverloadingJavaOverridingOverloading(Overriding)“”(Overloading)Overloade

5、dSet? =equals()? ? Setiterator()equals()Setequals()=equals()runtime exceptionArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptySt

6、ackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException, ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderExc

7、eption, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException errorexception? error exception List, Set, MapCollection? ListSetMapabstract classinterface? 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - -

8、 - 名师精心整理 - - - - - - - 第 3 页，共 6 页 - - - - - - - - - abstract classabstract Abstract interfacestatic finalinstanceof abstractmethodstatic,nativesynchronized? ? (implements)? (concrete class)? (implements)run()start()? start()JVMrun()Constructoroverride? ConstructorOverridingOverloadingString? Strin

9、gfinalsynchronized? synchronizedtry returntryfinally codereturn? return名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 6 页 - - - - - - - - - : 28? C2 3 (x.equals(y) = true)hash code? hash code? Java swtichbytelongString? switchexpr1expr1switch case intshortchar

10、bytelong,string swtich: Singleton SingletonJavaClassSingleton: : privatestaticprivatepublicgetInstance,public class Singleton private Singleton() /private private static Singleton instance = new Singleton(); /classpublic static Singleton getInstance() return instance; : public class Singleton privat

11、e static Singleton instance = null; public static synchronized Singleton getInstance() /if (instance=null) 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 6 页 - - - - - - - - - instancenew Singleton(); return instance; : privatestatic名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 6 页 - - - - - - - - -