题解 | #类型判断#instanceof getClass
类型判断
https://www.nowcoder.com/practice/97223208ca954e67832da716b46e5d72
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws Exception {
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()) {
String className = scanner.next();
Base obj = (Base) Class.forName(className).newInstance();
System.out.println(getClassName(obj));
}
}
public static String getClassName(Base obj) {
//write your code here......
if(obj instanceof Base)
{
return obj.toString();
}
else if(obj instanceof Sub1)
{
return obj.toString();
}
else if(obj instanceof Sub2)
{
return obj.toString();
}
return "Object";
}
}
class Base {
public String toString()
{
return "Base";
}
}
class Sub1 extends Base {
public String toString()
{
return "Sub1";
}
}
class Sub2 extends Base {
public String toString()
{
return "Sub2";
}
}
- instanceof运算符判断obj是否属于右边类所创建对象，instanceof是Java的保留关键字。
a instanceof A
2.传入的是一个实例，我们对这个实例调用getClass().getName()即可
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