基本数据类型的包装类Integer, Float, Double,Long,Byte等都实现的Comparable接口,用于列表List或数组arrays的排序 Comparable<Integer>接口方法的实现,对象列表的升序降序接口 我们通过重写该接口方法,可以对列表进行升序或降序排列. public int compareTo(T o); This interface imposes a total ordering on the objects of each class that
主要对类名,类所拥有的方法,以及所传参数起约束和规范做用,感觉跟php abstract 抽象类又有点像. 一,接口的定义和调用 <?php interface face1 { const param = 'test'; public function show(); } class test implements face1 { public function show() { echo "interface is run<br>"; } } $face = new
class Student implements Comparable<Student> { // 指定类型为Student private String name ; private int age ; private float score ; public Student(String name,int age,float score){ this.name = name ; this.age = age ; this.score = score ; } public String to
1)声明部: public final class Integer extends Number implements Comparable<Integer> extends Number, 重写方法: public byte byteValue() { return (byte)value; } public short shortValue() { return (short)value; } public int intValue() { return value; } public l