# Learn Solidity Series 3: constructor

**Published by:** [Renaissance Labs](https://paragraph.com/@renaissance-labs/)
**Published on:** 2022-02-25
**URL:** https://paragraph.com/@renaissance-labs/learn-solidity-series-3-constructor

## Content

Learn Solidity SeriesBefore Solidity 0.4.22默认构造方法与Java类似，如果未指定会采用默认的构造方法。当然，也可以明确指定构造方法。通过function指定了Solidity的构造方法，同时也可以像Java一样，给构造方法指定参数，但无法像Java那样创建多个重载的构造方法。pragma solidity ^0.4.21; contract DemoTest{ function DemoTest() public{ } } After Solidity 0.4.22使用constructor来定义构造函数pragma solidity ^0.4.22; contract DemoTest{ constructor() public{ } }

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