importjava.util.List;importjava.util.ArrayList;publicclassCourse{privateStringname;privateintcredit;privateList<Student>allStudents;publicCourse(){this.al...

importjava.util.List;importjava.util.ArrayList;publicclassSchool{privateStringname;privateList<Student>allStudents;publicSchool(){this.allStudents=newArra...

importjava.util.Properties;publicclassPropertiesDemo01{publicstaticvoidmain(Stringargs[]){Propertiespro=newProperties();//创建Properties对象pro.setProperty("BJ","Be...

importjava.util.Stack;publicclassStackDemo{publicstaticvoidmain(Stringargs[]){Stack<String>s=newStack<String>();s.push("A");//入栈s.push("B");//入栈s.pu...

importjava.util.Collections;importjava.util.List;importjava.util.Set;publicclassCollectionsDemo01{publicstaticvoidmain(Stringargs[]){List<String>allList=C...

importjava.util.Map;importjava.util.SortedMap;importjava.util.TreeMap;publicclassSortedMapDemo{publicstaticvoidmain(Stringargs[]){SortedMap<String,String>...

importjava.util.IdentityHashMap;importjava.util.HashMap;importjava.util.Set;importjava.util.Iterator;importjava.util.Map;classPerson{privateStringname;privatein...

importjava.util.HashMap;importjava.util.Map;importjava.util.Set;importjava.util.Iterator;publicclassForeachDemo02{publicstaticvoidmain(Stringargs[]){Map<Stri...

importjava.util.HashMap;importjava.util.Map;publicclassHashMapDemo01{publicstaticvoidmain(Stringargs[]){Map<String,String>map=null;//声明Map对象，其中key和value的类...

importjava.util.Vector;importjava.util.Enumeration;publicclassEnumerationDemo01{publicstaticvoidmain(Stringargs[]){Vector<String>all=newVector<String&g...

importjava.util.ArrayList;importjava.util.List;importjava.util.ListIterator;publicclassListIteratorDemo01{publicstaticvoidmain(Stringargsp[]){List<String>...

importjava.util.List;importjava.util.ArrayList;importjava.util.Iterator;publicclassIteratorDemo01{publicstaticvoidmain(Stringargs[]){List<String>all=newAr...

importjava.util.SortedSet;importjava.util.TreeSet;publicclassTreeSetDemo05{publicstaticvoidmain(Stringargs[]){SortedSet<String>allSet=newTreeSet<String...

importjava.util.Set;importjava.util.HashSet;classPerson{privateStringname;privateintage;publicPerson(Stringname,intage){this.name=name;this.age=age;}publicStrin...

importjava.util.HashSet;importjava.util.Set;publicclassHashSetDemo01{publicstaticvoidmain(Stringargs[]){Set<String>allSet=newHashSet<String>();allSe...