for else in java - Brave Search

Efficient implementation for: "Python For Else Loop" in Java

stackoverflow.com › questions › 13069402 › efficient-implementation-for-python-for-else-loop-in-java

It's done like this:

class A {
    public static void main(String[] args) {
        int n = 13;
        found: {
            for (int x : new int[]{2,3,4,5,6,7,8,9,10,11,12})
                if (n % x == 0) {
                    System.out.println("" + n + " equals " + x + "*" + (n/x));
                    break found;
                }
            System.out.println("" + n + " is a prime number");
        }
    }
}

$ javac A.java && java A
13 is a prime number

Answer from Dog on Stack Overflow

w3schools.com › java › java_conditions.asp

Java If ... Else

assert abstract boolean break byte ... double else enum exports extends final finally float for if implements import instanceof int interface long module native new package private protected public return requires short static super switch synchronized this throw throws transient try var void volatile while Java String ...

Programming Idioms

programming-idioms.org › idiom › 223 › for-else-loop › 5447 › java

for else loop, in Java

a: { b: { int i, n = items.size(); for (i = 0; i < n; ++i) if (f(items.get(i))) break b; out.println("not found"); break a; } out.println("found"); } Java · Predicate<Item> condition; items.stream() .filter(condition) .findFirst() .ifPresentOrElse( item -> doSomething(i), () -> doSomethingElse()); Clojure · (if (seq (filter odd? my-col)) "contains odds" "no odds found") C++ if (std::any_of(items.begin(), items.end(), condition)) baz(); else DoSomethingElse(); C++ bool found = false; for (const auto item : items) { if (item == "baz") { baz(); found = true; break; } } if (!found) { DoSomethingElse(); } C# if (!items.Any(i => MatchesCondition(i))) { DoSomethingElse(); } Dart ·

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stackoverflow.com › questions › 13069402 › efficient-implementation-for-python-for-else-loop-in-java

Efficient implementation for: "Python For Else Loop" in Java - Stack Overflow

It's done like this:

class A {
    public static void main(String[] args) {
        int n = 13;
        found: {
            for (int x : new int[]{2,3,4,5,6,7,8,9,10,11,12})
                if (n % x == 0) {
                    System.out.println("" + n + " equals " + x + "*" + (n/x));
                    break found;
                }
            System.out.println("" + n + " is a prime number");
        }
    }
}

$ javac A.java && java A
13 is a prime number

When I need to do something like this, if no extra information is needed, I typically try to break it out into a separate method - which can then return true/false or alternatively either the value found, or null if it's not found. It doesn't always work - it's very context-specific - but it's something worth trying.

Then you can just write:

for (...) {
    if (...) {
       return separateMethod();
    }
}
return null; // Or false, or whatever

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datacamp.com › doc › java › else

else Keyword in Java: Usage & Examples

The else keyword in Java is used in conjunction with the if statement to execute a block of code when the condition specified in the if statement evaluates to false. It provides an alternative path of execution in conditional logic. The else keyword is used to define a block of code that will ...

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Java if...else (With Examples)

Here, the value of number is 0. So both the conditions evaluate to false. Hence the statement inside the body of else is executed. Note: Java provides a special operator called ternary operator, which is a kind of shorthand notation of if...else...if statement.

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The if-then and if-then-else Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

If a second statement is later ... would be forgetting to add the newly required braces. The compiler cannot catch this sort of error; you'll just get the wrong results. The if-then-else statement provides a secondary path of execution when an "if" clause evaluates to false. You could use an ...

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If, If..else Statement in Java with Examples

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codingshuttle.com › home › handbooks › java programming handbook › java if else statement

Java if else statement | Coding Shuttle

April 9, 2025 - This blog explains the Java if-else statement with clear syntax, flow of execution, and practical examples. It covers basic, else-if, nested conditions, and the use of logical operators to help you write effective decision-making logic in Java.

stackoverflow.com › questions › 64709117 › how-to-use-else-condition-outside-the-for-loop-in-java

how to use else condition outside the For Loop in java - Stack Overflow

When the image name is found then the condition will be break and set the name in JLable. But when image name not found, the else condition, should be run. Where to write else condition? i want to show the message when image name is not found. for( k=0;k<imageList.length;k++) { if(imageList[k].equals(name)) { lblShowName.setText("Image Code : "+imageList[k]); ImageIcon imgicon = new ImageIcon(file+"\\"+imageList[k]); lblImage.setIcon(imgicon); break; } } java ·

tutorialspoint.com › java › if_else_statement_in_java.htm

Java if-else Statement

The if statement in Java checks a Boolean expression and executes a specific block of code only if the condition is true. The if-else statement allows Java programs to handle both true and false conditions.

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IF ELSE Java Statements

A video game like Fortnight uses an if else statement to determine if a player hits another player based on if the shot lands in a determined hitbox. A password checker compares your input with a stored password, and if it matches, it lets you in. Else, it doesn’t and tells you that the passwords don’t match. So, even considering how versatile an if else java statement is, you can make it even more versatile by adding more conditions.

Published January 16, 2025

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How to Use If...Else Statements in Java %

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June 23, 2025 - The compiler turns the structure into a chain of conditional jumps. The pattern stays the same. Fail one, move to the next. If no condition passes, Java either skips everything or runs the else if there is one. The else block is for all cases that didn’t match anything above.

datacamp.com › doc › java › java-if-else

Consider using logical operators (&&, ||) or breaking logic into separate methods. Use else if for Multiple Conditions: When you have multiple conditions to check, use else if to avoid unnecessary evaluations and improve performance. Braces {} Usage: Always use braces {} even for single-line blocks. This improves readability and prevents errors during code maintenance. Boolean Expressions: Ensure your boolean expressions are correct and meaningful for the context of your application logic. Build your Java skills from the ground up and master programming concepts.

w3schools.com › java › ref_keyword_else.asp

Java else Keyword

Java Examples Java Videos Java ... Syllabus Java Study Plan Java Interview Q&A ... Use the else statement to specify a block of code to be executed if the condition is false....

w3schools.com › java › java_for_loop.asp

assert abstract boolean break byte ... double else enum exports extends final finally float for if implements import instanceof int interface long module native new package private protected public return requires short static super switch synchronized this throw throws transient try var void volatile while Java String ...

stackoverflow.com › questions › 10791030 › while-else-loop

java - while-else-loop - Stack Overflow

Am I missing something?

Doesn't this hypothetical code

while(rowIndex >= dataColLinker.size()) {
    dataColLinker.add(value);
} else {
    dataColLinker.set(rowIndex, value);
}

mean the same thing as this?

while(rowIndex >= dataColLinker.size()) {
    dataColLinker.add(value);
}
dataColLinker.set(rowIndex, value);

or this?

if (rowIndex >= dataColLinker.size()) {
    do {
        dataColLinker.add(value);
    } while(rowIndex >= dataColLinker.size());
} else {
    dataColLinker.set(rowIndex, value);
}

(The latter makes more sense ... I guess). Either way, it is obvious that you can rewrite the loop so that the "else test" is not repeated inside the loop ... as I have just done.

FWIW, this is most likely a case of premature optimization. That is, you are probably wasting your time optimizing code that doesn't need to be optimized:

For all you know, the JIT compiler's optimizer may have already moved the code around so that the "else" part is no longer in the loop.
Even if it hasn't, the chances are that the particular thing you are trying to optimize is not a significant bottleneck ... even if it might be executed 600,000 times.

My advice is to forget this problem for now. Get the program working. When it is working, decide if it runs fast enough. If it doesn't then profile it, and use the profiler output to decide where it is worth spending your time optimizing.

I don't see why there is a encapsulation of a while...

Use

//Use the appropriate start and end...
for(int rowIndex = 0, e = 65536; i < e; ++i){        
    if(rowIndex >= dataColLinker.size()) {
         dataColLinker.add(value);
     } else {
        dataColLinker.set(rowIndex, value);
     }    
}