freeCodeCamp/guide/chinese/java/built-in-functions/index.md

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---
title: Built-In Functions
localeTitle: 内置功能
---
# 内置功能
Java还有许多内置或预定义的函数它们通常存储在java.lang和java.io包中 它们会在BlueJ等编辑器中自动导入或者可以使用以下语法导入 -
```java
import java.lang.*;
import java.io.*;
```
这些功能包括使其他长期和艰巨任务更容易完成的功能。