CODEWITHSUNDEEP
java
user1293258
user1293258

Reputation: 99

Java syntax - if without using codeblocks

if(true)    
  System.out.println("one");   
System.out.println("two);
System.out.println("three);

First it seems weird but it works. My question is just for clarification: if I don't use code blocks anything after if will be affected; if I use codeblock just inside the codeblocks will be affected - am I right? or is there something that I dont know happening through this example?

Upvotes: 1

Views: 370

Answers (4)

Mark Rotteveel
Mark Rotteveel

Reputation: 109079

The Java Language Specification for the if statement defines:

IfThenStatement:
    if ( Expression ) Statement

Statement is further defined as:

Statement:
    StatementWithoutTrailingSubstatement
    <removed for brevity>

StatementWithoutTrailingSubstatement:
    Block
    <removed for brevity>

In other words: An if statement contains a Statement, which can be a Block (which is a list of statements between brackets).

Upvotes: 0

Ramesh Kotha
Ramesh Kotha

Reputation: 8322

In Java if can be written in two ways

if(true){
//statement 1
//statement 2
//statement 3
}

if you want to execute multiple lines, you have to use block. If you want to use single line you can use with out block.

if(true)
//statement 1

but one line statement also can be written in block, it will work same.

if(true){
//statment 1
}

works same as with out block

Upvotes: 1

Dmitry Zaytsev
Dmitry Zaytsev

Reputation: 23972

Your case is equivalent to:

if(true){
    System.out.println("one");
}
System.out.println("two");
System.out.println("three");

and output will be

one
two
three

if statement executes operator (in your case, it's only System.out.println("one"), that follows behind it. Figure braces ({}) is operator too. For example:

if(false)
System.out.println("one");
System.out.println("two");
System.out.println("three");

/*output will be:
two
three
*/

//and in this case there will be no output
if(false){
    System.out.println("one");
    System.out.println("two");
    System.out.println("three");
}

Upvotes: 9

Black
Black

Reputation: 5080

In Java (and in similar languages), a single statement is equivalent to a block containing that single statement.

Upvotes: 0

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