Java 类选择器：根据输入动态调用 A 类或 B 类

public class ClassChooser {

public static void chooseClass(String input) { if (input.equals('A')) { A a = new A(); a.method(); } else if (input.equals('B')) { B b = new B(); b.method(); } else { System.out.println('Invalid input!'); } }

}

class A { public void method() { System.out.println('This is A class.'); } }

class B { public void method() { System.out.println('This is B class.'); } }

// Example usage: // ClassChooser.chooseClass('A'); // Output: This is A class. // ClassChooser.chooseClass('B'); // Output: This is B class. // ClassChooser.chooseClass('C'); // Output: Invalid input!