如何在Java中将字符串值从一个类调用到另一个类

Question

so in one class I have this string: String LB = lcfield.getText(); to store whatever is written inside the JTextField . In another class I have a SQL statement where I need to use the same value as whatever is inside the LB string.

How to call this string?

Answer 1

Inside the class that owns the JTextField :

public String getLcfieldText() {
   return lcfield.getText();
}

And next to the SQL-statement, you can simply do:

String lcFieldText = fooView.getLcfieldText();

Answer 2

You have a couple of options.

One option is to make the String LB variable a static public variable of your first class, or private with a getter method to retrieve it.

The second option depends on how the first class creates an instance of your second. You could make a constructor that accepts a string value, which you would pass in when creating the object to call the sql.

I guess it depends on how you have you program setup. I have something like this in a swing program I wrote. I store the sql string in a public static String variable of my gui java class. Then when I need to execute the sql, I create an instance of the second class, then call it's sql method that takes a String parameter as input, which is where I pass my String value in to execute.

For example. Class one has public static String mySql; Class two has a method named executeSql(String sql);

After I create some sql in a string in Class one, I create an instance of Class two and call classTwo.executeSql(mySql);