java - 新手问题: how to access a created JComboBox instance from another method in the same class or else

Question

如果我有:

Class A {

    // bunch of stuff here

    public void intitialize() {
    // bunch of stuff here

    JComboBox jBox = new JComboBox()

    formatBox.addItem(//some objects added here))
    //I do the rest of my business in this intitialize method

    } 

}

如果我想添加另一个在调用时可以在 jBox 上操作的方法，我该怎么做？此代码不起作用:

Class A {

             // bunch of stuff here
             public void intitialize() {
             // bunch of stuff here
             JComboBox jBox = new JComboBox()
             formatBox.addItem(//some objects added here))
             //I do the rest of my business in this intitialize method
             }

            //newly added method
            public void anotherMethod(){

            jBox.removeItem(//some item here)

            }

}

允许从类或其他类的不同方法访问 jBox 的正确编写方法是什么？为什么它不能这样工作？

Answer 1

将 JComboBox 定义为 A 类中的字段，并删除 initialize 方法中的类型声明:

Class A {
             private JComboBox  jBox;
             // bunch of stuff here
             public void intitialize() {
             // bunch of stuff here
             jBox = new JComboBox()
             formatBox.addItem(//some objects added here))
             //I do the rest of my business in this intitialize method
             }

            //newly added method
            public void anotherMethod(){

            jBox.removeItem(//some item here)

            }

}