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1、 JAVA? ?100? ?Math.random()? ?01?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?STR
2、INGBUFFER? 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
3、(11.5)? Math.round(-11.5)? Math.round(11.5)?12?Math.round(-11.5)?-11; Java?goto?Gotojava?java? ?length()? String?length()? ?length()?length? String?length()? Overload?Override?Overloaded? ? ? ? ?(Overriding)? ? ? ? ?“?”? ? ? (Overloading)?Overloaded? ?runtime exception? ? IndexOutOfBoundsException C
4、lassCastException 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 ? JA
5、VA?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 ?,?,?
6、 ?:? 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) FatherCla
7、ss 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() InterClas
8、s 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? Co
9、llection ?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 ? ? 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
