小编Rep*_*tic的帖子

嘿家伙得到这个错误:你们可以尝试解决这个问题吗？或者看到什么是错误的修复或其他东西

非常感谢你的家伙:)

Exception in thread "ExtensionHandler-1" java.lang.NoSuchMethodE
rror: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/Concu
rrentHashMap$KeySetView;
        at aerivial.requests.aqw.GetAction.process(GetAction.java:196)
        at it.gotoandplay.smartfoxserver.controllers.ExtensionHandler.processEve
nt(ExtensionHandler.java:535)
        at it.gotoandplay.smartfoxserver.controllers.ExtensionHandler.run(Extens
ionHandler.java:344)
        at java.lang.Thread.run(Thread.java:619)

错误代码:

        ConcurrentHashMap tgtBuffDebuffs = (ConcurrentHashMap)userTgt.properties.get(Users.BUFFS_DEBUFFS);

        for (Iterator i = tgtBuffDebuffs.keySet().iterator(); i.hasNext(); ) { int auraId = ((Integer)i.next());
          Aura aura = (Aura)World.instance.auras.get(Integer.valueOf(auraId));
          if ((aura.getDamage() >= 0.0D) && (!aura.getCategory().equals("d"))) {
            damage = (int)(damage * aura.getDamage());
          }
        }

嗨所以我试图让这个事件发生变化,因为某些原因状态更新它不允许我编译它给出错误:

The event 'Entity.StateChanged' can only appear on the left hand side of += or -=

我不知道什么是错的似乎我试过谷歌它没有帮助

public Entity.State state
{
    get
    {
        return this._state;
    }
    set
    {
        if (this._state != value)
        {
            this._state = value;
            this.OnStateChanged();
        }
    }
}

protected virtual void OnStateChanged()
{
    if (this.StateChanged != null)
    {
        this.StateChanged();
    }
}

public event Action StateChanged
{
    [MethodImpl(MethodImplOptions.Synchronized)]
    add
    {
        this.StateChanged += value;
    }
    [MethodImpl(MethodImplOptions.Synchronized)]
    remove
    {
        this.StateChanged -= value;
    }
}

谢谢你们的时间和帮助!

我试图隐藏除从jcomboBox的索引（cbLists）中获得的1以外的所有jList，它并没有真正隐藏它像禁用而不是隐藏的jList，我需要它隐藏所有像完全不可见的1这是我正在尝试的代码：

package javaapplication2;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;


public class Form1 extends javax.swing.JFrame {

    public Form1() {
        initComponents();

        ActionListener actionListener = (ActionEvent e) -> {
            System.out.println("Selected: " + cbLists.getSelectedItem());
            System.out.println(", Position: " + cbLists.getSelectedIndex());
            setCB(cbLists.getSelectedIndex());
        };
        cbLists.addActionListener(actionListener);
    }

    private void setCB(int index) {
        switch (index) {
            case 1:
                jList1.setVisible(false);
                jList4.setVisible(false);
                jList3.setVisible(false);
                jList2.setVisible(true);
                break;
            case 2:
                jList1.setVisible(false);
                jList2.setVisible(false);
                jList3.setVisible(true);
                jList4.setVisible(false);
                break;
            case 3:
                jList1.setVisible(false);
                jList2.setVisible(false);
                jList3.setVisible(false);
                jList4.setVisible(true);
                break;
            default:
                jList1.setVisible(true);
                jList2.setVisible(false);
                jList3.setVisible(false);
                jList4.setVisible(false);
                break;
        }

    }

    /**
     * This method is called …