java - 在 JComboBox 中显示数组内容

Question

我有两个类，其中一个类读取文件中的文本并将数据放入数组中，在主类中我想将数组内容添加到 JComboBox 中。但我收到错误“无法解析为变量”有帮助吗？

readfiles.java

public class readfiles {
String [] names = new String[15];
int i = 0;
public Scanner readNames;

//Opens the file
public void openFile() {
    try {
        readNames = new Scanner(new File("ChildName.txt"));
    } catch (Exception e) {
        System.out.println("Could not locate the data file!");
    }
}

//Reads the names in the file
public void readFile() {
    while(readNames.hasNext()) {
        names[i] = readNames.next();
        System.out.println(Arrays.toString(names));
        System.out.println(names[i]);
        i++;
    }
}

//Closes the file 
public void closeFile() {
    readNames.close();
}

}

Main.java

   //JComboBox for selecting child
    JLabel selectChildName = new JLabel("Please Select Your Child:");
    sPanel.add(selectChildName);
    JComboBox<String> selectChild = new JComboBox<String>(names); // (names); is the error, cannot be resolved to a variable
                sPanel.add(selectChild);

Answer 1

您将无法访问 main 中可用的名称，因为它不在 main 的范围内。要访问它，请创建 readfiles 类的实例，然后通过执行 instance.names; 获取名称；

例如，

readfiles instance = new readfiles();
instance.openfile();
instance.readfile();
instance.closefile();
JComboBox<String> selectChild = new JComboBox<String>(instance.names);