Java 物件 getClass() 方法

什麼是 Java 物件 getClass() 方法？

方法頭

public final Class<?> getClass()

返回類型

例子

public class DriverClass {

	public static void main(String[] args) {

		Object myObject = 25;
		Class myObjectClass = myObject.getClass();
		System.out.println("Class of \"" + myObject + "\" = " + myObjectClass.getName());

		myObject = Float.NaN;
		myObjectClass = myObject.getClass();
		System.out.println("Class of \"" + myObject + "\" = " + myObjectClass.getName());

		myObject = Short.MIN_VALUE;
		myObjectClass = myObject.getClass();
		System.out.println("Class of \"" + myObject + "\" = " + myObjectClass.getName());

		myObject = 37.99999999000099990;
		myObjectClass = myObject.getClass();
		System.out.println("Class of \"" + myObject + "\" = " + myObjectClass.getName());

		myObject = Long.MAX_VALUE;
		myObjectClass = myObject.getClass();
		System.out.println("Class of \"" + myObject + "\" = " + myObjectClass.getName());

		myObject = "This is a String.";
		myObjectClass = myObject.getClass();
		System.out.println("Class of \"" + myObject + "\" = " + myObjectClass.getName());
	}
}

輸出

結論