Replace For-Loop with Iterable::forEach

Description

This rule replaces enhanced for loops (for-each-loops) with an invocation of java.lang.Iterable::forEach-method and passes the body of the for-loop as a lambda Consumer parameter.

There are some special cases, in which the transformation won't be possible due to restrictions of lambda expressions and the Consumer interface.

Benefits

Using functional coding style instead of imperative loops improves the readability and makes the code more compact.

Tags

Tags

Java 8, Lambda, Loop, Marker

Code Changes

Single statement in loop body

Pre

for (String string : stringList) {
    System.out.println(string);
}

Post

stringList.forEach(s -> System.out.println(s));

Multiple statements in loop body

Pre

for (String value : values) {
    int length = value.length();
    if (length > 2) {
        length /= 2;
    }
    print(value.substring(0, length));
}

Post

stringList.forEach(value -> {
    int length = value.length();
    if (length > 2) {
        length /= 2;
    }
    print(value.substring(0, length));
});

Use a Java Refactoring Tool

No license required

You can review this refactoring on your code without a license by installing jSparrow to your Eclipse IDE. Install the plug-in from Eclipse IDE: Eclipse Marketplace.

System-wide Refactoring

Do you want to automate this refactoring (and many more) to your system-wide code? The automatic application of this system-wide refactoring can be unlocked by acquiring your jSparrow license.

Properties

Property	Value
Rule ID	EnhancedForLoopToStreamForEach
First seen in jSparrow version	2.0.0
Minimum Java version	8
Remediation cost	15 min