java：ArrayList循环遍历的俩种方法使用
package collection;
import java.util.*;
public class NewArrayList {
public static void main(String[] args) {
List<Student> students = new ArrayList<Student>();
for (int i = 0; i < 6; i++) {
students.add(new Student("Happy"+i,"male"+i,20+i));
}
print(students);
print2(students);
}
//循环遍历①for
public static void print(List<Student> newList){
System.out.println("总数据："+newList.size());
Student student;
for (int i = 0; i < newList.size(); i++) {
student = (Student)newList.get(i);
System.out.println(student.toString());
}
}
//循环遍历①Iterator
public static void print2(List<Student> newList){
System.out.println("总数据："+newList.size());
Iterator<Student> iterator = newList.iterator();
Student student;
while (iterator.hasNext()){
student = (Student)iterator.next();
System.out.println(student.toString());
}
}
}
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package com.njty.util;
public class Test {
private static final double EARTH_RADIUS = 6378137;
private static double rad(double d)
{
return d * Math.PI / 180.0;
}
......
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public static int dayOfWeek(int y, int m, int d) {
int w = 1; // 公历一年一月一日是星期一，所以起始值为星期日
y = (y-1)%400 + 1; //&n ......
package arrays.file;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
i ......
