The foreach loop, added in Java 5 (also called the "enhanced for loop"), is equivalent to using a java.util.Iterator – Alex78191 Commented Nov 21, 2019 at 19:10

In Java 8 collection classes that implement Iterable (for example, all Lists) now have a forEach method, which can be used instead of the for loop statement demonstrated above. (Here is another question that provides a good comparison.)

2014年3月24日 · Since Java 5, you can use the enhanced for loop for this. Assume you have (say) a List<Thingy> in the variable thingies. The enhanced for loop looks like this: for (Thingy t : thingies) { // ... } As of Java 8, there's an actual forEach method on iterables that accepts a lambda function: thingies.forEach((Thingy t) -> { /* ...your code here...

2013年5月19日 · The advantage of Java 1.8 forEach method over 1.7 Enhanced for loop is that while writing code you can focus on business logic only. forEach method takes java.util.function.Consumer object as an argument, so It helps in having our business logic at a separate location that you can reuse it anytime. Have look at below snippet,

2012年2月17日 · Loop using forEach. forEach is a function which is located on Array.prototype which takes a callback function as an argument. It then executes this callback function for every element in the array. In contrast to the map() function, the forEach function returns nothing (undefined). For example:

2009年6月10日 · The short version of for loop (T stands for my custom type): for (T var : coll) { //body of the loop } is translated into: for (Iterator<T> iter = coll.iterator(); iter.hasNext(); ) { T var = iter.next(); //body of the loop } and the Iterator for my collection might look like this:

Lambda Expression Java 8 In Java 1.8 (Java 8) this has become lot easier by using forEach method from Aggregate operations( Stream operations ) that looks similar to iterators from Iterable Interface.

2010年3月16日 · If you use Java 8 with Eclipse Collections, you can use the CharAdapter class forEach method with a lambda or method reference to iterate over all of the characters in a String. Strings.asChars("xyz").forEach(c -> System.out.print(c)); This particular example could also use a method reference. Strings.asChars("xyz").forEach(System.out::print)

2015年4月25日 · Iterable.forEach guarantees that wrapping and throwing the exception like in that example works: Exceptions thrown by the action are relayed to the caller. However, it would be better to simply avoid using forEach in a context that throws a checked exception, or catch and handle the exception in the body of the lambda.

2012年4月11日 · No, foreach is specially designed only for iterating all the elements of an array or collection. If you want you can check condition inside it and use break keyword for getting out of loop in middle.