大数据Java基础第十天作业
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import java.util.List; import java.util.ArrayList; class ListDemo{ @SuppressWarnings(value="unchecked") public static void main(String[] args){ List list = new ArrayList(); list.add(100); list.add(new Integer(200)); list.add("one"); list.add(new String("two")); list.add(new Student("one",‘M‘,18)); list.add(new Student("two",‘F‘,18)); Student student = new Student(); student.setName("three"); student.setSex(‘F‘); student.setAge(100); list.add(student); List list_repeat = new ArrayList(); list_repeat.add(100); list_repeat.add(student); Boolean bool_list = list.containsAll(list_repeat);//包含list_repeat集合 Boolean bool_obj = list.contains(student);//包含student对象 list.remove(0);//移出集合第0个元素 list.remove(student);//移出集合中的student对象的元素 list.removeAll(list);//清空集合 System.out.println(bool_list); System.out.println(bool_obj); System.out.println(list.size()); System.out.println("----------"); Student s = null; for(int i=0;i<list.size();i++){ if(list.get(i) instanceof Student){ s = (Student)list.get(i); System.out.println("name:" + s.getName() + ",sex:" + s.getSex() + ",age:" + s.getAge()); }else{ System.out.println(list.get(i)); } } } } class Student{ private String name; private char sex; private int age; public Student(){ } public Student(String name,char sex,int age){ super(); this.name = name; this.sex = sex; this.age = age; } public void setName(String name){ this.name = name; } public String getName(){ return this.name; } public void setSex(char sex){ this.sex = sex; } public char getSex(){ return this.sex; } public void setAge(int age){ this.age = age; } public int getAge(){ return this.age; } }
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