Big Data Java Foundation Seventh day job

First question: Interface iwhite{    public void white ();} Interface irich{    public void rich ();} Interface ibeauti{    public void beauti ();} Interface iwrb extends iwhite,irich,ibeauti{};class richman{    public  void tomarry (IWRB&NBSP;WS) {        ws.white ();         ws.rich ();         ws.beauti ();     }}class marry{    public static void main ( String[] args) {        richman rm = new  RichMan ();         rm.tomarry (NEW&NBSP;IWRB () {             public void white () {                 system.out.println ("I ' m white !");             }             public void rich () {                 system.out.println ("I ' m rich !");             }             public void beauti () {                 system.out.println ("I ' m beauti !");             }         });     }} The second question:class trianle{    private int  A;    private int b;&nbSp;   private int c;    public void setedgea (int  Edge) {        this.a = edge;    }     public void setedgeb (Int edge) {        &NBSP;THIS.B&NBSP;=&NBSP;EDGE;&NBSP;&NBSP;&NBSP;&NBSP;}&NBSP;&NBSP;&NBSP;&NBSP;PUBLIC&NBSP;VOID&NBSP;SETEDGEC ( Int edge) {        this.c = edge;     }    public void check ()  throws Exception{         int max;        int other;         if (a >= b && a >=  c) {            max = a;             other = b + c;        } Else if (b >= a && b >= c) {             max = b;             other = a + c;        } else{            max = c;             other = a + b;         }        if (max >  Other) {            throw new exception (" The length of the triangle side is set incorrectly! ");        }else{             System.out.println ("It's a triangle! ");        }    }}class throwdemo{     public static void main (String[] args) {         try{            Trianle  Trianle = new trianle ();             trianle.setedgea (;            ) Trianle.setedgea (&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;TRIANLE.SETEDGEC);             trianle.check ();         }catch (exception e) {             e.printstacktrace ();        }     }} third question: Class invalidparamexcetion extends exception{    public  Invalidparamexcetion (string msg) {        super (msg);   &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN (msg);    }}class person{     private string birthday;        public  string getbirthday () {        return birthday;     }    public void setbirthday (Int year,int month,int  day)  throws invalidparamexcetion{        if (year  < 1900 | |  year > 2016) {            throw  new invalidparamexcetion ("The year is inappropriate, does not exist"  + year +  "month");        &nBSP;}         if (month < 1 | | &NBSP;MONTH&NBSP;&GT;&NBSP;12) {            throw  new invalidparamexcetion ("Month does not fit, does not exist"  + month +  "month");         }        if (day < 1 | | &NBSP;DAY&NBSP;&GT;&NBSP;31) {            throw  new invalidparamexcetion ("date inappropriate, not present"  + day +  "Day");         }else{            boolean  monday =  (month == 1 | |  month == 3 | |  month == 5 | |  month == 8 | |  month == 10 | | &NBSP;MONTH&NBSP;==&NBSP;12);          &Nbsp;  if (monday && day != 31) {                 throw new invalidparamexcetion ("date not appropriate, Does not exist " + day + " Day ");             }else if (month == 2 && day > 29) {                 throw new invalidparamexcetion (" The date is inappropriate and does not exist " + day + " Day ");             }else if (month == 2 && year % 4 != 0 & & day == 29) {                 throw new invalidparamexcetion ("date inappropriate, not present"  + day +  "Day");             }        }         birthday =  "Birthday is:"  + year +  "Year"  + month  +  "Month"  + day +  "Day";    }}class throwdemo{     public static void main (String[] args) {         try{            person person  = new person ();             Person.setbirthday (2016,2,10);             System.out.println (Person.getbirthday ());         }catch ( Invalidparamexcetion e) {             E.printstacktrace ();       &nbSP;&NBSP;}&NBSP;&NBSP;&NBSP;&NBSP}} Fourth: currently in 07 directory 1, create Pack.java file package a.b.c.d;class pack{     public static void main (String[] args) {         system.out.println ("Hello world ...");     }}2, creating Classes Directory 3, compiling   JAVAC&NBSP;-D&NBSP;CLASSES/&NBSP;PACK.JAVA4, packing &NBSP;JAR&NBSP;CVFE&NBSP;PACK.JAR&NBSP;A.B.C.D.PACK&NBSP;-C  classes/ .5, perform  java -jar pack.jar a.b.c.d.pack fifth: 1, create 08 folder 2, cmd into 08 file execution, Java  -jar pack.jar a.b.c.d.pack

This article from "Do Not Tang donation" blog, please be sure to keep this source http://senlinmin.blog.51cto.com/6400386/1772343

Big Data Java Foundation Seventh day job