BASIC ELEMENTS OF JAVA - Java Programming: From Problem Analysis to Program Design - page 52

The following Java program shows the effect of the preceding statements:
// This program illustrates how data in the variables are
// manipulated.

public class Example2_13
{

public static void main(String[] args)
{

int num1;
int num2;

double sale;

char first;

String str;

num1 = 4;
System.out.println("num1 = " + num1);

num2 = 4 * 5 - 11;
System.out.println("num2 = " + num2);

sale = 0.02 * 1000;
System.out.println("sale = " + sale);

first = 'D';
System.out.println("first = " + first);

str = "It is a sunny day.";
System.out.println("str = " + str);

}

}

Sample Run:

num1 = 4
num2 = 9
sale = 20.0
first = D
str = It is a sunny day.

For the most part, the preceding program is straightforward. Let us take a look at the
output statement:

System.out.println("num1 = " + num1);

This output statement consists of the string "num1 = " , + , and the variable num1 . Here,
the value of num1 is concatenated with the string "num1 = " , resulting in the string
"num1 = 4" , which is then output. The meanings of other output statements are similar.