2016/5/30 Study Record

1. Simulation stack

 PackageExercise;Importjava.util.ArrayList;Importjava.util.Arrays;Importjava.util.Collection;Importjava.util.Collections;ImportJava.util.Scanner; Public classTest { Public Static voidMain (string[] args) {ArrayList<Object> list =NewArraylist<>(); Test a=NewTest (list); System.out.print ("is the steak empty?");    System.out.println (A.isempty ()); A.push (2); A.push (3); A.push (5); System.out.print ("The size of the steak is");    System.out.println (A.getsize ()); System.out.print ("is the steak empty?");    System.out.println (A.isempty ()); System.out.print ("Get the Peek number");    System.out.println (A.peek ()); System.out.print ("Pop the Peek and return it");    System.out.println (A.pop ()); System.out.print ("Now, the peak is");    System.out.println (A.peek ()); System.out.print ("The size of the steak");    System.out.println (A.getsize ()); System.out.print ("List the Numbers");    System.out.println (A.tostring ()); } Test (ArrayList<Object>list) {         This. List =list; }    //class test simulation stack        PrivateArraylist<object>list;  Public BooleanIsEmpty () {returnList.isEmpty (); }     Public intGetSize () {returnlist.size (); }     PublicObject Peek () {returnList.get (List.size ()-1); }     PublicObject Pop () {object o= List.get (List.size ()-1); List.remove (List.size ()-1); returno; }     Public voidpush (Object i) {list.add (i); }     PublicString toString () {return"The steak is" +list.tostring (); }}

The output is as follows

True3 is thesteak emptyfalse5return it 53  2List The numbers the steak is [2, 3]

2. Object as an example of a member variable, clock.

 PackageExercise; Public classTimes {Private intlimit; Private intnum = 0; Times (intlimit) {         This. Limit =limit; }    intGetlimit () {returnlimit; }    intGetnum () {returnnum; }    voidtick () {num++; if(num = =limit) Num= 0; }    voidShow () { while(true) {tick ();        SYSTEM.OUT.PRINTLN (num); }    }     PublicString toString () {if(Num < 10)            return"0" +num; Else            return"" +num; }     Public Static voidMain (string[] args) {//TODO auto-generated Method StubTimes T =NewTimes (24);    T.show (); }}

This function defines how the numbers bounce. Next, refer to the two times object as a variable in another class

1  PackageExercise;2 3  Public classShowTime {4     PrivateTimes hours =NewTimes (24);5     PrivateTimes minutes =NewTimes (60);6 7     voidShow () {8          while(true) {9 Minutes.tick ();Ten             if(Minutes.getnum () = = 0) One Hours.tick (); A             //System.out.printf ("%02d:%02d\n", Hours.getnum () -             //, Minutes.getnum ()); -System.out.println (Hours + ":" +minutes); the         } -  -     } -  +      Public Static voidMain (string[] args) { -         //TODO auto-generated Method Stub +ShowTime st =NewShowTime (); A st.show (); at         //String s = "123"; -         //Integer i = n; -         //s=i+ ""; -         //System.out.println (s); -     } -  in}

In line 14th, the ToString function in times is called directly with hours and minutes, because hours+ ":" The compiler determines that the default hours is a string, so call it directly.

2016/5/30 Study Record