我试图编写一个for每个循环来打印一个列表的条目。
这是我的第一个方法:
public Staff() {
staffList = new StaffMember[4];
staffList[0] = new Executive("Sam", "123 Main Line",
"555-0469", "123-45-6789", 2423.07);
staffList[1] = new Employee("Carla", "456 Off Line"
在AbstractCollection中有一个奇怪的代码
public Object[] toArray() {
// Estimate size of array; be prepared to see more or fewer elements
Object[] r = new Object[size()];
Iterator<E> it = iterator();
for (int i = 0; i < r.length; i++) {
if (! it.hasNext()) // fewer elements than
package com.ripal;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
public class Outputs {
public void show() {
final ArrayList<String> list = new ArrayList<String>();
list.add("banana");
list.add("apple
有没有注意到循环构造forEach和for/of在“迭代期间添加”项上的行为?ForEach忽略了数组中有新添加的项的事实,并且for/of动态地更改迭代器,并继续运行,直到数组中没有元素。这个现象的原因是什么,使用聪明的词语?我在堆栈溢出上的第一个帖子,所以没有判断解释是否简单...谢谢
let my_array1 = [1,2,3]
let my_array2 = ["a", "b", "c"]
//extra iteration cycles were not dynamically added. Loop ends after pre-
我实现了一个MatrixIt类来遍历一个2D数组。是否有可能使代码更清晰、更短?
public class MatrixIt implements Iterator<Integer> {
private final int[][] data;
private int row = 0;
private int column = 0;
public MatrixIt(int[][] data) {
this.data = data;
}
@Override
public boolean hasNext() {
我用C++编写了以下程序
#include<iostream>
using namespace std ;
int main()
{ int a,i , *p;
string str[4] = {"one","two","three","four"};
p = &a ; // stores address of a into p
*p = 12 ;