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doc: Update java.md (#311)

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添加List和Set集合中打印时使用lamba输出的方式。
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Fuku-L 2023-02-23 23:34:24 +08:00 committed by GitHub
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@ -595,6 +595,8 @@ nums.remove(0); // 非常慢
for (Integer value : nums) { for (Integer value : nums) {
System.out.println(value); System.out.println(value);
} }
// lambda 打印元素
nums.forEach(e -> System.out.println(e.toString()));
``` ```
### HashMap ### HashMap
@ -653,6 +655,7 @@ set.remove("cat");
for (String element : set) { for (String element : set) {
System.out.println(element); System.out.println(element);
} }
set.forEach(e -> System.out.println(e.toString()));
``` ```
### ArrayDeque ### ArrayDeque