demoinstanceof.java

来自「国外的数据结构与算法分析用书」· Java 代码 · 共 41 行

public class DemoInstanceOf
{
	public static void main(String args[])
	{
		Employee emp = new Employee("Paul", "farm", 98764);
		SalariedWorker sal = new SalariedWorker("Jeremy", "1119 6th St.", 550342, 1439);
		HourlyWorker hW = new HourlyWorker("Scott", "cardboard box", 23456, 8, 21.5f);

		if(emp instanceof Employee)
			System.out.println("emp is good");
		if(sal instanceof Employee)
			System.out.println("sal is good");
		if(hW instanceof Employee)
			System.out.println("hw is good");

		if(emp instanceof SalariedWorker)
			System.out.println("emp is good");
		if(sal instanceof SalariedWorker)
			System.out.println("sal is good");
//		if(hW instanceof SalariedWorker)
//			System.out.println("hw is good");

		if(emp instanceof HourlyWorker)
			System.out.println("emp is good");
//		if(sal instanceof HourlyWorker)
//			System.out.println("sal is good");
		if(hW instanceof HourlyWorker)
			System.out.println("hw is good");

		Object tempE = sal;
		SalariedWorker sal2 = (SalariedWorker) tempE;
		System.out.println(sal);
		System.out.println(tempE);

		System.out.println(tempE instanceof SalariedWorker);
		SalariedWorker tempS = (SalariedWorker) tempE;
		System.out.println(tempS);

	}
}