java私有构造如何获取实例

Question

问题遇到的现象和发生背景

怎么获取PropertyUtils的实例，想让他走这个私有构造器，外面怎么调用

问题相关代码，请勿粘贴截图

public class PropertyUtils extends PropertyUtilsBase {

private PropertyUtils(){
    this.init();
}

private static final PropertyUtilsBase propertyUtils = new PropertyUtils();

@Override
protected String getPropertiesFilePath() {
    return "common.hadoop.properties";
}

}

Answer 1

public class PropertyUtils extends PropertyUtilsBase{
    private PropertyUtils(){
        this.init();
    }

    private static final PropertyUtilsBase propertyUtils = new PropertyUtils();

    @Override
    protected String getPropertiesFilePath() {
        return "common.hadoop.properties";
    }

    /**
     * 获取propertyUtils
     * @return
     */
    public static PropertyUtilsBase getInstance(){
        return propertyUtils;
    }
}

外部获取，直接调用getInstance()方法