[初学者]为什么这个程序会抛“java.lang.NullPointerException”？

[番茄家]

MyFirstMIDlet1.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class MyFirstMIDlet1 extends MIDlet
{
	private Display myDisplay;
	
	public void MyFirstMIDlet1()
	{
		myDisplay = Display.getDisplay(this);
	}

	public void startApp()
	{
        Form myForm = new Form("MyFirstMIDlet1");
        myDisplay.setCurrent(myForm);
	}

	public void pauseApp(){}
	
	public void destroyApp(boolean unconditional)
	{
		notifyDestroyed();
	}
}

这个程序运行时有错“java.lang.NullPointerException”，而下面这个程序没有！
MyFirstMIDlet2.java

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class MyFirstMIDlet2 extends MIDlet
{
	public void MyFirstMIDlet2()
	{
	}

	public void startApp()
	{
		Displayable current = Display.getDisplay(this).getCurrent();
        if(current == null)
        {
            Form myForm = new Form("MyFirstMIDlet");
            Display.getDisplay(this).setCurrent(myForm);
        }
	}

	public void pauseApp(){}
	
	public void destroyApp(boolean unconditional)
	{
		notifyDestroyed();
	}
}

有没有哪位好心人指点一下，谢谢！

[awusoft]

MyFirstMIDlet1 extends MIDlet
{
private Display myDisplay;

public void MyFirstMIDlet1()
这里有个方法与类的名字一样，却不是构造函数？可以的吗？

[番茄家]

确实，我的构造函数写错了！基础太差，继续学习！谢谢指正！