Code working

.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="lib" path="D:/!IOTPI_App_Code/IOTAPP_Pi/lib/pi4j-core.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>DHT12_Pi</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

README.md

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+There are supposed to be 5 bytes returned:
+0x00 = Humidity
+0x01 = Humidity decimal places
+0x02 = Temperature
+0x03 = Temperature decimal places
+0x04 = Checksum (sum 0x00,0x01,0x02,0x03)
+
+Arduino example returns data like this:
+45,6,24,0,75 - which means 45.6 %RH, 24.0 deg C, (valid checksum 45+6+24+0=75)
+45,6,23,9,83 - which means 45.6 %RH, 23.9 deg C, (valid checksum 45+6+23+9=83)
+45,7,23,9,84 - which means 45.7 %RH, 23.9 deg C, (valid checksum 45+7+23+9=84)

src/in/weargenius/main/Main.java

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+package in.weargenius.main;
+
+import com.pi4j.io.i2c.I2CBus;
+import com.pi4j.io.i2c.I2CDevice;
+import com.pi4j.io.i2c.I2CFactory;
+
+public class Main {
+
+    private static I2CDevice   dev = null;
+    static boolean x =false;
+	public static void main(String[] args) throws Exception{
+		System.out.println("DHT12 Pi4j Example.");
+        I2CBus bus = I2CFactory.getInstance(I2CBus.BUS_1); //
+
+        dev = bus.getDevice(0x5c); //Address for MCp23017 change if A0,A1,A2 are connected to diff potenrial
+        byte data[] = new byte[5];
+        dev.read(0x00,data, 0,5);
+        if(x){
+	     	System.out.println(data[0]); //Humidity
+	     	System.out.println(data[1]); //HUmidity decimal places
+	     	System.out.println(data[2]); //Temperature
+	     	System.out.println(data[3]); //Temperature decimal places
+	     	System.out.println(data[4]); // Checksum = data[0]+data[1]+data[2]+data[3]
+        }
+
+     	if(data[4]==(data[0]+data[1]+data[2]+data[3])){
+
+         	double humidity=Double.parseDouble(data[0]+"."+data[1]);
+         	double temperature=Double.parseDouble(data[2]+"."+data[3]);
+         	System.out.println("humidity is : "+humidity+" %RH");
+         	System.out.println("Temperature is : "+temperature+" °C");
+     	}
+     	else
+     		System.out.println("Error in communication.");
+	}
+
+
+}