In this session, we will learn different types of loop statements in Java and will see how to use them in a program. 本节课我们将学习多种循环语句并进行代码实现。 Opening Problem 问题导入 Suppose you need to display a string (e.g. Welcome to Java!) a hundred times. 假如你要输出"Welcom...
Note that all expressions in thefor-loopare optional. In case, we do not provide theterminationexpression, we must terminate the loop inside the statements else it can result in aninfinite loop. 2. Java For-loop Example In the following program, we are iterating over an array ofintvalues....
In Java, the do-while loop is used to execute statements again and again. This loopexecutes at least oncebecause the loop is executed before the condition is checked. It means loopcondition evaluates after executing 至少执行一次,因为该循环是在检查条件之前执行的。 这意味着在执行循环体后评估循环...
See the Java Operators guide to learn more. Short hand While loop If you want to make a quick and small while loop, you can do it all within one line using the following format. while (condition) //statements; Loop control statements There are several loop control in Java, that as ...
Since Java 1.5, the for-each loop or enhanced for loop is a concise way to iterate over the elements of an array and a Collection.
Monitor Performance: Be cautious with loops that may result in high computational costs or memory usage, especially when dealing with large datasets or complex operations. Debugging: Use print statements or a debugger to trace loop execution and ensure it behaves as expected, particularly during devel...
The only time you should use a do-while loop is when you want to execute the statements inside the loop at least once, even though condition expression returns false. Otherwise, it’s always better to use a while loop. Java while loop looks cleaner than a do-while loop. That’s all ...
Thefor-eachand equivalentforstatements have these forms. The two basic equivalent forms are given, depending one whether it is an array or anIterablethat is being traversed. In both cases an extra variable is required, an index for the array and an iterator for the collection....
In for-loops and while-loops, there are two cases, where instead of a block, just a semicolon is allowed, e.g. for (int i = 2; i < 10; i++); while (i++ < 20); These are considered legitimate empty statements by this rule. It could be written with an empty block ({})...
If testExpression is true, statements inside the body of while loop are executed. Then, testExpression is evaluated again. The process goes on until testExpression is evaluated to false. If testExpression is false, the loop terminates (ends). To learn more about test expressions (when testExpr...