Java Note 4__static keyword/object array variable parameters for/foreach/method

/*** Static keyword: a modifier attribute (which is essentially a global variable), a method (calling this method without an object of this class), or a class. * 1.static method can only call static method * 2.static method can only access static data * 3.static method cannot refer to this or super in any way*/ Public classMain { Public Static voidMain (string[] args) {A a=NewA (); A.val = 2; A A1=NewA (); A1.val = 3; System.out.println (A.val+" "+a1.val); b b=NewB (); B.val = 2; B B1=NewB (); B1.val = 3; System.out.println (B.val+ "" +b1.val);//B and B1 have the same share ValA.say (); }}classa{intval = 1;  Public Static voidsay () {System.out.println ("Hello~~"); }}classb{Static intval = 1;//static data does not belong to the object, belonging to the class}

Importjava.lang.String;Importjava.util.Arrays;ImportJava.util.Scanner;/*** Object Array*/ Public classMain { Public Static voidMain (string[] args) {Monkeymanager mm=NewMonkeymanager (); Mm.add (NewMonkey ("1")); Mm.add (NewMonkey ("2")); Mm.add (NewMonkey ("2")); Mm.add (NewMonkey ("4")); Mm.delete ("2");                Mm.list (); Monkey Temp1=NewMonkey ("1");        Mm.update (TEMP1);    Mm.list (); }}classmonkeymanager{PrivateMonkey[] ms =NewMonkey[3]; Private intCount = 0;  Public voidAdd (Monkey m) {if(count<ms.length) {Ms[count++] =m; System.out.println ("Successful Add Monkey:" +m.name); }        Else{System.out.print ("The space is full!" To expand .... "); intNewlen = (ms.length*3)/2+1; Ms=arrays.copyof (MS, Newlen); System.out.println ("The extended length is:" +Newlen); Ms[count++] =m; System.out.println ("Successful Add Monkey:" +m.name); }    }     Public voidlist () { for(inti=0;i<count;++i) Ms[i].say (); }     Public voidDelete (String name) {BooleanFlag =true;  while(flag) {flag=false;  for(intI=0;i<count;++i)if(ms[i].name.equals (name)) { for(intJ=I;J&LT;COUNT-1;++J) ms[j]=ms[j+1]; Ms[count-1] =NULL; --count; System.out.println ("Successful Delete monkey:" +name); Flag=true;  Break; }        }    }     PublicMonkey Find (String name) { for(intI=0;i<count;++i)if(ms[i].name.equals (name))returnMs[i]; return NULL; }     Public voidUpdate (Monkey m) {Monkey s=find (M.name); if(s!=NULL) {S.name= "HelloWorld"; }    }}classmonkey{String name;  PublicMonkey (String name) { This. Name =name; }     Public voidsay () {System.out.println ("I ' m" +name); }}

 Public classMain { Public Static voidMain (string[] args) {/*** foreach Syntax * for (type variable name: Array or collection) {//output operation}*/string[] Names= {"1", "2", "3", "4"};  for(String i:names) System.out.println (i); /*** Variable parameter of method * 1. Only one * 2. When there are multiple parameters, the variable parameter is placed in the last*/method1 (names); METHOD2 (123, "A1", "A2", "A3"); METHOD2 (123, names); }     Public Static voidmethod1 (string[] na) { for(String i:na) System.out.println (i); }     Public Static voidMETHOD2 (intX,string. Na) {//parameter is a variable parameter (only one)System.out.println ("x=" +x);  for(String i:na) System.out.println (i); }}

Java Note 4__static keyword/object array variable parameters for/foreach/method