1. 概述此处着重深入剖析 Java 里核心语法结构当中的一个, 也就是被称作 for 循环的部分, 它是用来帮助我们处理重复操作的有效手段, 在诸如数组遍历、集合迭代以及计数循环等场景里有广泛的运用。对于被掌握的 for 的形形的写法以及适用场景而言, 不仅能够写出更为简洁的代码, 而且还能够避免一些潜藏着的“坑”。2. 基础 for 循环最经典的循环结构之中就有基础for循环, 它借助初始化, 以及条件判断, 还有步进操作这三个部分, 来对循环执行予以控制。其语法结构如下for (初始化; 布尔表达式; 步进操作) 语句;来看一个最简单的例子for (int i 0; i 5; i) { System.out.println(Simple for loop: i i); }输出Simple for loop: i 0 Simple for loop: i 1 Simple for loop: i 2 Simple for loop: i 3 Simple for loop: i 4注意, for循环存在三个部分, 分别是初始化、条件、步进, 这三个部分都是可以选择省略的。要是全部都省略掉的话, 那么就会形成一个没有终止的循环:for ( ; ; ) { // 无限循环等价于 while(true) }这样的一种写法, 虽说较为少见, 然而在某些特定的事件监听情况之下, 或者是守护线程之中, 依旧是具备使用场景的, 要记住应与break配合着去使用, 不然的话, 就会持续不断地一直运行下去。2.1. 带标签的 for 循环当碰到多层嵌套循环情形时, 平常的 break 以及, 仅仅能够作用于最里面那层循环, 在这个时候, 就需要带有标签的 for 循环去精确把控跳转。看下面这个例子aa: for (int i 1; i 3; i) { if (i 1) continue; bb: for (int j 1; j 3; j) { if (i 2 j 2) { break aa; } System.out.println(i j); } }输出2 1 3 1 3 2 3 3解释一下这种写法, 在处理复杂嵌套逻辑的时候, 是非常有用的, 然而, 也需要注意一点, 千万别滥用, 不然的话, 就会对代码可读性造成影响。3. 增强 for 循环for-each从Java 5开始被引入的增强for循环, 也就是所谓的for-each, 使得对数组以及集合进行遍历这件事变得简单又直接。语法如下for (元素类型 变量名 : 集合或数组) 语句;它背后的核心思想是把 items 里的每一个元素, 赋予 item 变量, 接着去落实循环体之中的内容, 从而执行循环体。进而执行循环体才对。来看个数组遍历的例子int[] intArr { 0, 1, 2, 3, 4 }; for (int num : intArr) { System.out.println(Enhanced for-each loop: i num); }输出Enhanced for-each loop: i 0 Enhanced for-each loop: i 1 ...3.1. 遍历常见数据结构增强 for 循环适用于所有实现了 接口的类型比如List 遍历List list Arrays.asList(A, B, C); for (String item : list) { System.out.println(item); }Set 遍历Set set new HashSet(Arrays.asList(X, Y, Z)); for (String item : set) { System.out.println(item); }Map 遍历通过 Map map new HashMap(); map.put(Alice, 25); map.put(Bob, 30); for (Map.Entry entry : map.entrySet()) { System.out.println(Key: entry.getKey() - Value: entry.getValue()); }️ 注意增强 for 循环虽然简洁但有几点限制3.2. .() 与自 Java 8 起始, 接口额外增添了()方法, 与表达式相联合, 致使遍历愈趋带有函数式特征。其默认实现如下default void forEach(Consumer action) { Objects.requireNonNull(action); for (T t : this) { action.accept(t); } }可以看到它底层依然是基于增强 for 循环实现的。使用示例List names new ArrayList(); names.add(Larry); names.add(Steve); names.add(James); names.add(Conan); names.add(Ellen); names.forEach(name - System.out.println(name));输出Larry Steve James Conan Ellen4. 总结循环类型适用场景是否可修改集合是否支持索引基础 for需要索引、反向遍历、复杂控制增强 for (for-each)简单遍历数组/集合函数式风格结合 使用选择哪种 for 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