String name1=s1.getName().toUpperCase(); String name2=s2.getName().toUpperCase();// 正序排列returnStudentName1.compareTo(StudentName2);//逆序排列//return StudentName2.compareTo(StudentName1);}};/* 根据rollno进行排序*/publicstaticComparator<Student> StuRollno =newComparator<Student>() {pub...
sort(new Comparator<Student>() { @Override public int compare(Student o1, Student o2) { // 升序排序 if (o1.age > o2.age) { return 1; } else { return -1; } } }); for (int i = 0; i < list.size(); i++) { System.out.println(list.get(i).toString()); } } } 执行...
在Java中比较两个ArrayList可以使用equals()方法或者使用循环逐个比较元素。 使用equals()方法比较: ArrayList类继承自AbstractList类,而AbstractList类实现了List接口,List接口继承自Collection接口。因此,ArrayList类继承了equals()方法,可以直接使用该方法比较两个ArrayList是否相等。 使用equals()方法比较: ArrayList类继承自...
1/**2* age 的比较器3*/4publicstaticComparator<JobCandidate> ageComparator =newComparator<JobCandidate>() {5@Override6publicintcompare(JobCandidate o1, JobCandidate o2) {7//TODO Auto-generated method stub8return(o2.getAge() < o1.getAge() ? -1 : (o2.getAge() == o1.getAge() ? 0...
This method performs a linear search; therefore, this method is an O(n) operation, where n is Count. This method determines equality by calling Object.Equals. Starting with the .NET Framework 2.0, this method uses the collection's objects' Equals and CompareTo methods on item to determine ...
如果我们希望Javabean对象自身具有排序能力,则可以让Person类实现Comparable接口,并重写compareTo()方法来定义排序规则。以下是示例代码: importjava.util.ArrayList;publicclassMain{publicstaticvoidmain(String[]args){// 创建ArrayList对象ArrayList<Person>personList=newArrayList<>();// 添加Javabean对象personList.add(...
Ab dem .NET Framework 2.0 verwendet diese Methode die -ObjekteEqualsundCompareTo-Methodenitemder Auflistung, um zu bestimmen, ob ein Element vorhanden ist. In den früheren Versionen des .NET Framework wurde diese Bestimmung mithilfe derEqualsMethoden undCompareTodesitemParameters für die Objekt...
return s1.getAge().compareTo(s2.getAge()); // if (s1.getAge() > s2.getAge()) // return 1; // return -1; } } 总结 al.add(i,scan.nextInt()); } System.out.println("你输入的数字是:"); for(int i=0;i int temp=(int)al.get(i); ...
Thesort()method sorts items in the list. AComparatorcan be used to compare pairs of elements. The comparator can be defined by a lambda expression which is compatible with thecompare()method of Java'sComparatorinterface. Ifnullis passed into the method then items will be sorted naturally based...
public int compare(Object o1, Object o2) { Student s1 = (Student) o1; Student s2 = (Student) o2; return s1.getAge().compareTo(s2.getAge()); // if (s1.getAge() > s2.getAge()) // return 1; // return -1; } }