public class DataType 
{
	public static void main(String[] args) 
	{		     
	    float f = 10.0f;      //float
        double d = 100000.00; //double
		char c = 'S';         //char
	    String s = "Techknow"; //String 
	    long l = 2456L;  
	    int i= 102;//long
		
		System.out.println("float:-"+f);
		System.out.println("double:-"+c);
		System.out.println("char:-"+d);
		System.out.println("long:-"+l);
		System.out.println("string:-"+s);		 
	}
}

float:-10.0
double:-100000.0
char:-S
long:-2456
string:-Techknow

public class RefType
{
	public static void main(String agr[])
	{
		String a = new String ("Hello");
		String b= new String ("Hello");
		String c = a;
		if(a==c)
		{
			System.out.println("Same Ref ");
		}
		else
		{
			System.out.println("Not Same Ref "); 
		}
	}
}

Same Ref