Java 天地·Core Java·Lecture Notes·Unitt 3 - Core Java Programming Concepts

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Content Page # 4

Compound statements

Notice that some statements consist of more than a single line of the source file. For example the class declaration statement actually consists of the entire contents of the TicketDiscount.java source file. Likewise, the control statement 'if( age >= 60 ) ...' actually includes the statement 'System.out.println("qualifies for discount");' as well.

A compound statement is one that consists of a group of statements that are preceded with an open brace "{", and the last statement in the group followed by a close brace "}".

In the example there are 3 compound statements. The first is the class declaration itself:

class TicketDiscount
{
... // rest of class
}

The second is the declaration of the main() method:

public static void main( String args[] )
{
// rest of method
}

The third is the set of statements to be executed if the test of age is true:

if( age >= 60 )
{
System.out.println( age + "is 60 or over" );
System.out.println("qualifies for discount");
}

This example also illustrates how compound statements can be nested, i.e. the if statement is a statement within the compound statement that is the implementation of the main() method:

public static void main( String args[] )
{
...
if( age >= 60 )
    {
    System.out.println( age + "is 60 or over" );
    System.out.println("qualifies for discount");
    }
}

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