java.txt

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


-----------------------------------------------------

public
class java
{
    public static void main(String args[])
    {
int i;
float l;
double d;
i=2;
l=1;
d=i+l;
	System.out.println ("zmienna d= " +d);

l=(float)(d+i);

	System.out.println ("zmienna l= " +l);

i=(int)(d+l);

        System.out.println ("zmienna i= " +i);
    }
}

------------------------------------------------------------


public
class java
{
    public static void main(String args[])
    {
int i;
byte b;

i=100;
b=(byte)(i);

	System.out.println ("zmienna b=" +b +" zmienna i=" +i);

i=110;
b=(byte)(i);

	System.out.println ("zmienna b=" +b +" zmienna i=" +i);

i=120;
b=(byte)(i);

	System.out.println ("zmienna b=" +b +" zmienna i=" +i);

i=130;
b=(byte)(i);

	System.out.println ("zmienna b=" +b +" zmienna i=" +i);

	}
}

------------------------------------------------------------------

public
class java
{
    public static void main(String args[])
    {

String s="aaa";
String s1="bbb";
s=s+s1;
	System.out.println ("zmienna s=" +s);

	}
}