Lamda Expression 2

package calculator;

public class Calculator {
  
    interface IntegerMath {
        boolean check(int a); 
    }
  
     public boolean operateBinary(IntegerMath op, int x) {
        //return op.operation(a, b);
        //return op.operation(x, y, z);
        return op.check(x);
    }

    public static void main(String... args) {
    
        Calculator myApp = new Calculator();
        

        IntegerMath mycheck = (a) -> a == 90;
        
        System.out.println("is a equal to 90?= " +
            myApp.operateBinary(mycheck, 40));
        
    }
}

Generic Interface

http://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html

The interface Predicate is an example of a generic interface. 

Generic types (such as generic interfaces) specify one or more type parameters within angle brackets (<>). 
This interface contains only one type parameter, T. 

When you declare or instantiate a generic type with actual type arguments, you have a parameterized type.

Lambda Expression

public class Calculator {
  
    interface IntegerMath {
        int operation(int a, int b);   
    }
  
    public int operateBinary(int a, int b, IntegerMath op) {
        return op.operation(a, b);
    }
 
    public static void main(String... args) {
    
        Calculator myApp = new Calculator();
        IntegerMath addition = (a, b) -> a + b;
        IntegerMath subtraction = (a, b) -> a - b;
        System.out.println("40 + 2 = " +
            myApp.operateBinary(40, 2, addition));
        System.out.println("20 - 10 = " +
            myApp.operateBinary(20, 10, subtraction));    
    }
}

http://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html#syntax

package calculator;

public class Calculator {

  

    interface IntegerMath {

        int operation(int a, int b, int c); 

    }

  

    public int operateBinary(IntegerMath op, int x, int y, int z) {

        //return op.operation(a, b);

        return op.operation(x, y, z);

    }

    public static void main(String... args) {

    

        Calculator myApp = new Calculator();

        

        IntegerMath addition = (a, b, c) -> a + b + c;

        IntegerMath subtraction = (a, b, c) -> a - b - c;

        

        System.out.println("40 + 2 = " +

            myApp.operateBinary(addition, 40, 20, 10));

        

        System.out.println("20 - 10 = " +

            myApp.operateBinary(subtraction, 20, 10, 5));    

    }

}

Simple Java Code - calling another method

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package helloworldapp;

/**
 *
 * @author Kent Lau
 */
public class HelloWorldApp {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        System.out.println("Hello World!");
       
        int testscore = 76;
        char grade;
       
       
        System.out.println("Grade = " + testMyScore(testscore));
    }
   
    public static char testMyScore(int score) {
    //do the calculation here
   
        if (score >= 90) {
            return 'A';
        } else if (score >= 80) {
            return 'B';
        } else if (score >= 70) {
            return 'C';
        } else if (score >= 60) {
            return 'D';
        } else {
            return 'F';
        }
    }
   
}

Test

Android Advance Training: Autoreply sender via BoardcastReceiver

Complete Code

package com.k; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.telephony.SmsMessage; import android.widget.Toast; public class SMSReceiver2 extends BroadcastReceiver{        @Override        public void onReceive(Context context, Intent intent) {                             // Get the SMS message pass in               Bundle bundle = intent.getExtras();               String sOutput = "";                             if (bundle != null) {                                           // Retrieve the SMS message received                      Object[] pdus = (Object[]) bundle.get("pdus");                                           SmsMessage[] smsMessage = new SmsMessage[pdus.length];                                           for (int n = 0; n < smsMessage.length; n++) {                                                       smsMessage[n] = SmsMessage.createFromPdu((byte[]) pdus[n]);                                                       sOutput += "SMS from " + smsMessage[n].getOriginatingAddress();                            sOutput += " : ";                            sOutput += smsMessage[n].getMessageBody().toString();                            sOutput += "\n";                      }                                           // Show the new SMS message                      Toast.makeText(context, sOutput, Toast.LENGTH_SHORT).show();                                           // Send a broadcast intent to tell the activity about the new SMS received                      Intent broadcastIntent = new Intent();                      broadcastIntent.setAction("SMS_RECEIVED_ACTION");                      broadcastIntent.putExtra("sms", sOutput);                      context.sendBroadcast(broadcastIntent);                                    }        } }

package com.k; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.telephony.SmsManager; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class SMSReceiveAppActivity extends Activity {               Button btnSendSMS;        IntentFilter intentFilter;               private BroadcastReceiver intentReceiver = new BroadcastReceiver() {                      @Override        public void onReceive(Context context, Intent intent) {                             // display the SMS received in the TextView               TextView SMSes = (TextView) findViewById(R.id.textView1);               SMSes.setText(intent.getExtras().getString("sms"));                 try {                                             String sms = "Testing by Kent";                                             SmsManager smsManager = SmsManager.getDefault();                      smsManager.sendTextMessage("5554", null, sms, null, null);                                           Toast.makeText(getApplicationContext(), "Your SMS is sent successfully!",                                          Toast.LENGTH_LONG).show();                                      } catch (Exception e) {                                             Toast.makeText(getApplicationContext(),                            "Sending SMS faild!",                            Toast.LENGTH_LONG).show();                                      }               }               };     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);                 //---intent to filter for SMS messages received---         intentFilter = new IntentFilter();         intentFilter.addAction("SMS_RECEIVED_ACTION");                         btnSendSMS = (Button) findViewById(R.id.btnSendSMS);         btnSendSMS.setOnClickListener( new View.OnClickListener() {                       public void onClick(View v)         {                       //sendSMS(“5554”, “Hello my friends!”);         Intent i = new Intent(android.content.Intent.ACTION_VIEW);         i.putExtra("address", "5554");         i.putExtra("sms_body", "Hello my friends!");         i.setType("vnd.android-dir/mms-sms");                 startActivity(i);         }         });             }     @Override     protected void onResume() {     //---register the receiver---     registerReceiver(intentReceiver, intentFilter);     super.onResume();     }         @Override     protected void onPause() {     //---unregister the receiver---     unregisterReceiver(intentReceiver);     super.onPause();     }         //---sends an SMS message to another device---     private void sendSMS(String phoneNumber, String message)     {     //...     }     }

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >     <TextView         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="@string/hello" />     <TextView         android:id="@+id/textView1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="TextView" />     <Button         android:id="@+id/btnSendSMS"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Button" /> </LinearLayout>

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.k"     android:versionCode="1"     android:versionName="1.0" >     <uses-sdk android:minSdkVersion="8" />     <application         android:icon="@drawable/ic_launcher"         android:label="@string/app_name" >         <activity             android:name=".SMSReceiveAppActivity"             android:label="@string/app_name" >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>                       <receiver android:name=".SMSReceiver" android:enabled="true">                      <intent-filter>                            <action android:name="android.provider.Telephony.SMS_RECEIVED" />                      </intent-filter>               </receiver>                                    <receiver android:name=".SMSReceiver2">                            <intent-filter>                            <action android:name="android.provider.Telephony.SMS_RECEIVED" />                            </intent-filter>                      </receiver>                                        </application>     <uses-permission android:name="android.permission.SEND_SMS" />        <uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission>     </manifest>