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Control Flow Statements

When you write a program, you type Java language statements into a file. Without control flow statements, the interpreter executes these statements in the order they appear in the file from top to bottom, left to right. You can use control flow statements in your programs to conditionally execute statements, to loop over a block of statements, and so on. For example, in the following code snippet, the System.out.println statement within the curly brackets is executed only if the method call Character.isUpperCase(aChar) returns true:

if (Character.isUpperCase(aChar)) {
    System.out.println("The character " + aChar + " is upper case.");
}

The Java programming language provides several control flow statements, including:

Statement Type	Keyword
looping	while, do-while , for
decision making	if-else, switch-case
exception handling	try-catch-finally, throw
branching	break, continue, label:, return

• The while and do-while Statements
• The for Statement
• The if/else Statements
• The switch Statement
• Exception Handling Statements
• Branching Statements
• Summary of Control Flow Statements
• Questions and Exercises: Control Flow

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Note: Although goto is a reserved word, currently the Java programming language does not support the goto statement.

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