J2SE Container _map Interface _ generic type

Map Interface

Examples of Map methods

ImportJava.util.*; Public classTESTMAP2 { Public Static voidMain (String args[]) {Map<string, integer> m1 =NewHashmap<string, integer>(); M1.put ("One", 1); M1.put ("Both", 2); M1.put ("Three", 3);    System.out.println (M1.size ()); System.out.println (M1.containskey ("One")); if(M1.containskey ("the")) {      //int i = ((Integer) m1.get ("II")). Intvalue ();      inti = M1.get ("II"));    System.out.println (i); }  }}

Testmap2.java

ImportJava.util.*; Public classTestargswords {//private static final integer one = new integer (1);  Private Static Final intone = 1;  Public Static voidMain (String args[]) {Map m=NewHashMap ();  for(inti = 0; i < args.length; i++) {      //integer freq = (integer) m.get (Args[i]);            intFreq = (Integer) m.get (args[i]) = =NULL? 0: (Integer) M.get (Args[i]); //M.put (Args[i], (freq = = null?) One:new Integer (Freq.intvalue () + 1 ));M.put (Args[i], freq==0? One:freq + 1); } System.out.println (M.size ()+ "Distinct words detected:");  System.out.println (m); }}

TestargswordsJDK1.5 generics

ImportJava.util.*; Public classBasicgeneric { Public Static voidMain (string[] args) {List<String> C =NewArraylist<string>(); C.add ("AAA"); C.add ("BBB"); C.add ("CCC");  for(inti=0; I<c.size (); i++) {String s=C.get (i);        System.out.println (s); } Collection<String> C2 =NewHashset<string>(); C2.add ("AAA"); C2.add ("BBB"); C2.add ("CCC");  for(Iterator<string> it =c2.iterator (); It.hasnext ();) {String s=It.next ();        System.out.println (s); }    }}classMyNameImplementsComparable<myname> {    intAge ;  Public intcompareTo (MyName mn) {if( This. Age > Mn.age)return1; Else if( This. Age < Mn.age)return-1; Else return0; }}

Basicgeneric.java

ImportJava.util.*; Public classTestArgsWords2 {Private Static Final intone = 1;  Public Static voidMain (String args[]) {Map<string, integer> m =NewHashmap<string, integer>();  for(inti = 0; i < args.length; i++) {            if(!M.containskey (Args[i]))      {M.put (args[i], one); }      Else {          intFreq =M.get (Args[i]); M.put (Args[i], freq+ 1); }} System.out.println (M.size ()+ "Distinct words detected:");  System.out.println (m); }}

Testargswords2.javaSummary

J2SE Container _map Interface _ generic type