Block statement

Overview

Block will create a scope and holding the list of a statement. Block is also one of statements.

For example, if statement has a statement in then clause or else clause, but a block can be there instead of a single statement to hold a lot of statements.

if (a > 0)      System.println("positive"); // a single statement.
else if (a < 0) System.println("negative"); // a single statement.
else {
    // block here, instead of a single statement.
}

And also the block has a scope. The variable shadowing occurs if the same name of variable was declared. Please see the example 1.

Examples

Example 1. Scope

Code

var a = 10;
{
    var a = 100;
    System.println(a);  // => 100
}
System.println(a);  // => 10

Result

100
10