Question

我试图从dificultad方法中的变量actionPerformed获取值，以便在另一个类中使用它。但我真的不知道如何做到这一点。所以我不知道你是否可以提供帮助。

jComboBox1.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            int dificultad;
            if (jComboBox1.getSelectedItem() == "Facil") {
                dificultad = 10;
                System.out.println("Facil");
            } else if (jComboBox1.getSelectedItem() == "Intermedio") {
                dificultad = 8;
                System.out.println("Intermedio");
            } else if (jComboBox1.getSelectedItem() == "Dificil") {
                dificultad = 4;
                System.out.println("Dificl");
            } else if (jComboBox1.getSelectedItem() == "Extremo") {
                dificultad = 1;
                System.out.println("Extremo");
            }

        }

Answer 1

在班级顶部定义一个变量（public）。

public class testClass {
    public int testVar = 0;

    public void action(){
        jComboBox1.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            int dificultad;
            if (jComboBox1.getSelectedItem() == "Facil") {
                dificultad = 10;
                System.out.println("Facil");
            } else if (jComboBox1.getSelectedItem() == "Intermedio") {
                dificultad = 8;
                System.out.println("Intermedio");
            } else if (jComboBox1.getSelectedItem() == "Dificil") {
                dificultad = 4;
                System.out.println("Dificl");
            } else if (jComboBox1.getSelectedItem() == "Extremo") {
                dificultad = 1;
                System.out.println("Extremo");
            }
            testVar = dificultad;
        }
        }
    }
}

要在其他类中使用该值，只需传递类对象 - 例如 - main函数并访问该变量。

public class testClass2 {
    public testClass;

    public testClass2(testClass tc) {
        this.testClass = tc;
    }

    public void anotherAction(){
        if (this.testClass.testVar == 1) {
            System.out.println("Extremo!");
        }
    }
}

希望这有帮助。

Answer 2

//set a field to use outside the scope of addActionListener()
int laDificulty = 0;

jComboBox1.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            int dificultad;
            if (jComboBox1.getSelectedItem() == "Facil") {
                dificultad = 10;
                System.out.println("Facil");
            } else if (jComboBox1.getSelectedItem() == "Intermedio") {
                dificultad = 8;
                System.out.println("Intermedio");
            } else if (jComboBox1.getSelectedItem() == "Dificil") {
                dificultad = 4;
                System.out.println("Dificl");
            } else if (jComboBox1.getSelectedItem() == "Extremo") {
                dificultad = 1;
                System.out.println("Extremo");
            }
            laDificulty = dificultad;

        }

从actionPerformed方法中选择一个值

2 个答案: