【Java每日一題】20161229，java20161229

【Java每日一題】20161229，java20161229

package Dec2016;    import java.util.ArrayList;  import java.util.List;    public class Ques1229 {       public static void main(String[] args){         Student stu01 = new Student("001");         Student stu02 = new Student(null);           List<Student> students = new ArrayList<Student>();         students.add(stu01);         students.add(stu02);         System.out.println("students是否包含001學號："+students.contains(stu01));         System.out.println("students是否包含null："+students.contains(stu02));     }  }    class Student{      private String stuId;      public Student(String stuId) {         super();         this.stuId = stuId;      }      public String getStuId() {          return stuId;      }      public void setStuId(String stuId) {          this.stuId = stuId;      }        @Override      public boolean equals(Object obj) {          if(obj instanceof Student){              Student stu = (Student) obj;              return stuId.equalsIgnoreCase(stu.getStuId().trim());          }          return false;      }   }  

今日問題： 
請問主程式輸出結果是什嗎？（點擊以下“【Java每日一題】20161229”查看20161228問題解析） 

題目原發佈於公眾號、簡書：【Java每日一題】20161229，【Java每日一題】20161229 

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