运行时错误和编译时错误

package day01;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Test06 {
    
    public static void main(String[] args) {
        System.out.println("程序开始");
        
        String strDate = "2020-10-30";
        SimpleDateFormat s = new SimpleDateFormat("");
        try {
            Date date = s.parse(strDate);
        } catch (ParseException e) {
            e.printStackTrace();
        }


        String name = "www";
        try {
            int sam = Integer.parseInt(name);
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }

        
        System.out.println("-------------");
        Test06 te = new Test06();
        te.run();
        System.out.println("程序结束");
    }

    public static void run() throws NullPointerException {
        Integer ppd = null;
        ppd.intValue();
        System.out.println(ppd.intValue());
    }
}