Implicit and explicit casting : Primitive Type Casting 

An implicit cast means you don’t have to write code for the cast

An implicit cast happens when you’re doing a widening conversion.

public class MainClass{
    public static void main(String[] argv){
        int a = 100;
        long b = a; // Implicit cast, an int value always fits in a long
    }
}

An explicit casts looks like this:

public class MainClass{
    public static void main(String[] argv){
        float a = 100.001f;
        int b = (int)a; // Explicit cast, the float could lose info
    }
}

Impossible Conversions

• Any primitive type to any reference type
• The null value to any primitive type
• Any primitive to boolean
• A boolean to any primitive

The Remainder or Modulus Operator in Java

Java has one important arithmetical operator you may not be familiar with, %, also known as the modulus or remainder operator. The % operator returns the remainder of two numbers. For instance 10 % 3 is 1 because 10 divided by 3 leaves a remainder of 1. You can use % just as you might use any other more common operator like + or -.

class Remainder {

  public static void main (String args[]) {

    int i = 10;
    int j = 3;

    System.out.println("i is " + i);
    System.out.println("j is " + j);
  
    int k = i % j;
    System.out.println("i%j is " + k);
  }

}

Here’s the output:

<samp>% javac Remainder.java
% java Remainder
i is 10
j is 3
i%j is 1
</samp>

Perhaps surprisingly the remainder operator can be used with floating point values as well. It’s surprising because you don’t normally think of real number division as producing remainders. However there are rare times when it’s useful to ask exactly how many times does 1.5 go into 5.5 and what’s left over? The answer is that 1.5 goes into 5.5 three times with one left over, and it’s that one which is the result of 5.5 % 1.5 in Java.

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Type ‘javac’ space file name ‘demo.java’ : D:\java-test>javac demo.java

Run:

Type java space demo. will output Hello java!

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Step 1 : So just write this:

public class demo {

public static void main (String[]args) {
System.out.println("Hello Java!");
}
}

Now save this file with .java extension e.g. demo.java at any location/Folder. For example you save file in ‘D’ drive ‘java-test’ Folder ‘demo.java’. D:\java-test\demo.java

Step 2 : Now run ‘cmd’ : press window+R and type cmd and enter. Command prompt will open.

Step 3 : Now change folder location in cmd so java file can run so just type drive name e.g.
C:\Users\vipulrai>d:

Step 4 : Go to Folder ‘java-test’ in cmd

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1. Java SE Development Kit 8 Downloads

The JDK is a development environment for building applications, applets, and components using the Java programming language.

The JDK includes tools useful for developing and testing programs written in the Java programming language and running on the Java platform.

2. Now Install jdk

3. Paste URL Path to window so ‘cmd’ can read/execute java

Step 1 : Go to ‘C:\Program Files\Java\jdk1.8.0_102\bin’ Copy this path.

Step 2 : Now, right click on ‘My Computer/This PC’

Step 3 : click on ‘Properties’ then

Step 4 : find on top right hand side ‘Advanced System Settings‘

Step 5 : Click on ‘Environment Variables’  

Step 6 : Find Variable ‘path’ and double click on path a window will open with one path

Step 7 : Just add the path with semi colon which we copy on step 1.  
e.g. ;C:\Program Files\Java\jdk1.8.0_102\bin so final path in this box will be like this: C:\ProgramData\Oracle\Java\javapath;%C_EM64T_REDIST11%bin\Intel64;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files (x86)\Skype\Phone\;C:\Program Files\Java\jdk1.8.0_102\bin

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