JAVA39. 集合遍历
描述
请使用三种方式遍历一个list集合输入描述
键盘任意输入的五个int类型变量输出描述
使用三种不同的方法遍历集合，遍历输出时不换行，数字之间用空格隔开示例1
输入:
1 2 3 4 5
输出:
普通for循环:1 2 3 4 5 增强for循环:1 2 3 4 5 迭代器遍历:1 2 3 4 5
Go 解法, 执行用时: 3ms, 内存消耗: 1028KB, 提交时间: 2021-11-06
package main
import "fmt"
/*
一球从h米高度自由落下，每次落地后反弹回原高度的一半再落下，求它在第n次落地时共经过了多少米？第n次反弹多高？
输入描述:
输入小球的初始高度和落地的次数（先输入小球初始高度再输入反弹次数）
*/
func main() {
var a = make([]int, 5, 5)
for i := 0; i < 5; i++ {
fmt.Scan(&a[i])
}
fmt.Printf("普通for循环:")
for i := 0; i < 5; i++ {
fmt.Printf("%d ", a[i])
}
fmt.Printf("\n")
fmt.Printf("增强for循环:")
j := 0
for j < 5 {
fmt.Printf("%d ", a[j])
j++
}
fmt.Printf("\n")
fmt.Printf("迭代器遍历:")
for _, v := range a {
fmt.Printf("%d ", v)
}
}
Java 解法, 执行用时: 27ms, 内存消耗: 10580KB, 提交时间: 2022-02-08
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
List<Integer> list = new ArrayList<>();
int num1 = scanner.nextInt();
int num2 = scanner.nextInt();
int num3 = scanner.nextInt();
int num4 = scanner.nextInt();
int num5 = scanner.nextInt();
scanner.close();
list.add(num1);
list.add(num2);
list.add(num3);
list.add(num4);
list.add(num5);
System.out.print("普通for循环:");
//write your code here......
for (int i = 0; i < list.size(); i++) {
System.out.print(list.get(i) + " ");
}
System.out.println();
System.out.print("增强for循环:");
//write your code here......
for (int i: list) {
System.out.print(i + " ");
}
System.out.println();
System.out.print("迭代器遍历:");
//write your code here......
Iterator it = list.iterator();
while (it.hasNext()) {
System.out.print(it.next() + " ");
}
System.out.println();
}
}
Java 解法, 执行用时: 27ms, 内存消耗: 10600KB, 提交时间: 2022-02-08
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
List<Integer> list = new ArrayList<>();
int num1 = scanner.nextInt();
int num2 = scanner.nextInt();
int num3 = scanner.nextInt();
int num4 = scanner.nextInt();
int num5 = scanner.nextInt();
scanner.close();
list.add(num1);
list.add(num2);
list.add(num3);
list.add(num4);
list.add(num5);
System.out.print("普通for循环:");
//write your code here......
for(int i =0;i<list.size(); i++){
System.out.print(list.get(i)+" ");
}
System.out.println();
System.out.print("增强for循环:");
//write your code here......
for(int i:list){
System.out.print(i+" ");
}
System.out.println();
System.out.print("迭代器遍历:");
//write your code here......
Iterator<Integer> iterator = list.iterator();
while(iterator.hasNext()){
System.out.print(iterator.next()+" ");
}
System.out.println();
}
}
Java 解法, 执行用时: 29ms, 内存消耗: 10512KB, 提交时间: 2022-02-09
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
List<Integer> list = new ArrayList<>();
int num1 = scanner.nextInt();
int num2 = scanner.nextInt();
int num3 = scanner.nextInt();
int num4 = scanner.nextInt();
int num5 = scanner.nextInt();
scanner.close();
list.add(num1);
list.add(num2);
list.add(num3);
list.add(num4);
list.add(num5);
System.out.print("普通for循环:");
//write your code here......
for(int i = 0; i < list.size(); i++){
System.out.print(list.get(i) + " ");
}
System.out.println();
System.out.print("增强for循环:");
//write your code here......
for(int li : list){
System.out.print(li + " ");
}
System.out.println();
System.out.print("迭代器遍历:");
//write your code here......
Iterator it = list.iterator();
while(it.hasNext()){
System.out.print(it.next() + " ");
}
System.out.println();
}
}
Java 解法, 执行用时: 29ms, 内存消耗: 10608KB, 提交时间: 2021-11-20
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
List<Integer> list = new ArrayList<>();
int num1 = scanner.nextInt();
int num2 = scanner.nextInt();
int num3 = scanner.nextInt();
int num4 = scanner.nextInt();
int num5 = scanner.nextInt();
scanner.close();
list.add(num1);
list.add(num2);
list.add(num3);
list.add(num4);
list.add(num5);
System.out.print("普通for循环:");
//write your code here......
for(int i = 0;i<list.size();i++)
System.out.print(list.get(i)+" ");
System.out.println();
System.out.print("增强for循环:");
//write your code here......
for(int n:list)
System.out.print(n+" ");
System.out.println();
System.out.print("迭代器遍历:");
//write your code here......
Iterator i = list.iterator();
int tmp;
while(i.hasNext())
{
System.out.print(i.next()+" ");
}
System.out.println();
}
}