如何每个类仅创建一个实例

问题描述

即使在谷歌搜索后，我也没有找到完全合适的东西！

请帮助我.

修改:

有人可以用Singleton模式解释这一行吗?

Even after googling I didn''t find anything exactly fitting!

Please help me in this.

Modification:

Can somebody please explain this line in the Singleton pattern:

public class OnlyOne
{
    // Please explain this line too me
    private static OnlyOne instance = null;

    private OnlyOne()
    {
    }

    public static OnlyOne getInstance()
    {
        if(instance==null)
        {
            instance = new OnlyOne();
        }
        return instance;
    }
}

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