JAVA类，只要知道了类名(全名)就可以创建其实例对象，通用的方法是直接使用该类提供的构造方法，如

NewObject o = new NewObject();

NewObject o = new NewObject("test");

NewObject o = new NewObject(new String[]{"aaa","bbb"});

除此之外，还可以利用java.lang.Class类来实现JAVA类的实例化。

1、空构造方法

如果类有空构造方法，如下面的类

public class NewObject

{

String name;

public NewObject(String[] name)

{

this.name = name[0];

System.out.println(“ the object is created!”);

}

public void write()

{

System.out.println(this.name);

}

}

使用以下代码可实现实例化：

NewObject no = null;

try

{

no = (NewObject)Class.forName(className).newInstance();

no.write();

}

catch (InstantiationException e)

{

e.printStackTrace();

}

catch (IllegalAccessException e)

{

e.printStackTrace();

}

catch (ClassNotFoundException e)

{

e.printStackTrace();

}

2、带参数构造方法

public class NewObject

{

String name;

public NewObject()

{

System.out.println(“ the object is created!”);

}

public void write()

{

System.out.println(“”);

}

}

使用以下代码可实现实例化：

try

{

no = (NewObject)Class.forName(className).getConstructor(String.class).newInstance(names);

//no = (NewObject)Class.forName(className).getConstructor(new Object[]{String.class}).newInstance(names);   }

catch (IllegalArgumentException e)

{

e.printStackTrace();

}

catch (SecurityException e)

{

e.printStackTrace();

}

catch (InstantiationException e)

{

e.printStackTrace();

}

catch (IllegalAccessException e)

{

e.printStackTrace();

}

catch (InvocationTargetException e)

{

e.printStackTrace();

}

catch (NoSuchMethodException e)

{

e.printStackTrace();

}

catch (ClassNotFoundException e)

{

e.printStackTrace();

}

3、带数组参数构造方法

public class NewObject

{

String name;

public NewObject(String name)

{

this.name = name;

System.out.println(“ the object is created!”);

}

public void write()

{

System.out.println(this.name);

}

}

使用以下代码可实现实例化：

try

{

Constructor[] cs;

cs = Class.forName(className).getConstructors();

Constructor cc = Class.forName(className).getConstructor(String[].class);

no = (NewObject)cc.newInstance(new Object[]{names});   }

catch (SecurityException e)

{

e.printStackTrace();

}

catch (ClassNotFoundException e)

{

e.printStackTrace();

}

catch (NoSuchMethodException e)

{

e.printStackTrace();

}

catch (IllegalArgumentException e)

{

e.printStackTrace();

}

catch (InstantiationException e)

{

e.printStackTrace();

}

catch (IllegalAccessException e)

{

e.printStackTrace();

}

catch (InvocationTargetException e)

{

e.printStackTrace();

}