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());
}
}
}
相关文档：
公司用到串口编程，故开始研究，首先搜到的是javacomm20-win32.zip这个压缩包，按照网上的安装配置好，如下：
API
在javax.comm下有13个类和接口，分别是
4个接口
CommDriver 可负载设备（the loadable device）驱动� ......
（一）线程同步
实现生产者消费者问题来说明线程问题,举例如下所示:
/**
* 生产者消费者问题
*/
public class ProducerConsumer {
/**
* 主方法
*/
public static void main(String[] args) {
ProductBox pb = new ProductBox ......
package arrays.compara;
/**
*
* @author Happy 二分查找法
*/
public class BinarySearch {
public static void main(String[] args) {
int[] arrInt = { 2, 34, 32, 24, 23, 34, 12, 3, 4, 2 };
int index = bSearch(29, arrInt, 0, arrInt.length);
& ......
package arrays.compara;
import java.util.Arrays;
public class Student {
public static void main(String[] args) {
Stu[] stus = new Stu[]{
new Stu(156,34,"ad"),
new Stu(153,24,"cc"),
new Stu(126,37,"ab"),
......
package arrays.myArray;
public class MyArrayList {
private Object[] arrObj = new Object[3];
private int size = 0;
// 长度
public int size() {
return size;
}
// insert
public void add(Object obj) {
add(size,obj);
&nb ......
