在类中声明typescript类型

class MyClass {
  private myNumber: number;
  public myString: string;
  protected myBoolean: boolean;

  constructor() {
    this.myNumber = 10;
    this.myString = "Hello";
    this.myBoolean = true;
  }

  public myMethod(): void {
    // Method implementation
  }
}

class MyClass {
  private myNumber = 10;
  public myString = "Hello";
  protected myBoolean = true;

  constructor() {}

  public myMethod(): void {
    // Method implementation
  }
}