Explanation
1. The Chinese meaning of the while keyword is when..., that is, when the condition is established, the corresponding code is executed in a loop. The while statement is the basic structure in the loop statement, and the syntax format is relatively simple.
Execution process
2. When executing the while statement, first determine the loop condition. When the loop condition is false, directly execute the subsequent code of the while statement. If the loop condition is true, When, the loop body code is executed and the loop condition is judged until the loop condition is not established.
Examples
int i = 1; int sum = 0; while (i <= 100) { sum += i; i++; } System.out.println("1累加到100的结果是:" + sum);
What collection classes are there in Java
Collections in Java are mainly divided into four categories:
1, List List: ordered, repeatable;
2, Queue queue: ordered, repeatable;
3, Set collection: non-repeatable;
4, Map mapping: unordered, unique keys, non-unique values.
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