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xiangwb
2018-02-27 14:06:21 +08:00
parent ccd1e6e8df
commit 01beabfa60
3 changed files with 47 additions and 55 deletions
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boot-service/src/main/java/com/xwbing/demo/CollectionDemo.java
+1
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@@ -8,6 +8,7 @@ import java.util.*;
/**
* 创建日期: 2017年2月16日 下午4:06:56
* 作者: xiangwb
* 说明: ArrayList初始容量为10,容量不足,会扩充为原有容量的1.5倍+1。然后通过底层的复制方法将原有数据复制过来
*/
public class CollectionDemo {
boot-service/src/main/java/com/xwbing/demo/ForEachMap.java
+40 -42
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@@ -13,35 +13,35 @@ import java.util.Set;
* 遍历所有的key
* 遍历所有的key-value对
* 遍历所有的value（相对不常用）
*
* @author xiangwb
* --------------------------------------------------------------------------------------------------------------------------------
* 说明: HashMap初始容量capacity为16,加载因子loadFactor为0.75,临界值threshold=capacity*loadFactor,如果元素个数超过临界值,capacity*2
*
* @author xiangwb
*/
public class ForEachMap {
public static void main(String[] args) {
Map<String,Integer> map=new HashMap<String,Integer>();
map.put("语文", 99);
map.put("数学", 98);
map.put("英语", 97);
map.put("物理", 96);
map.put("化学", 99);
System.out.println(map);
/*
* 遍历所有的key
public static void main(String[] args) {
Map<String, Integer> map = new HashMap<String, Integer>() {
{
put("语文", 99);
put("数学", 98);
put("英语", 97);
put("物理", 96);
put("化学", 99);
}
};
/*
* 遍历所有的key
* set<k> keySet()
* 该方法会将当前map中所有的key存入一个set集合后返回
* 那么遍历该集合就等于遍历类所有的key
*/
Set<String> keySet=map.keySet();
for(String key:keySet){
System.out.println(key);
}
Set<String> keySet = map.keySet();
for (String key : keySet) {
System.out.println(key);
}
/*
* 遍历每一组键值对（推荐）
* 遍历每一组键值对（推荐）
* map中每一组键值对都是由map的内部类：
* java.util.map.entry的一个实例类表示的
* entry有两个方法：getkey getvalue 可以分别获取这一组键值对中的key和value
@@ -50,29 +50,27 @@ public class ForEachMap {
* 该方法会将map中的每一组键对（entry实例）
* 存入一个set集合后返回
*/
Set<Entry<String,Integer>> entrySet=map.entrySet();
for(Entry<String,Integer> e:entrySet){
String key=e.getKey();
Integer value=e.getValue();
System.out.println(key+":"+value);
}
Set<Entry<String, Integer>> entrySet = map.entrySet();
for (Entry<String, Integer> e : entrySet) {
String key = e.getKey();
Integer value = e.getValue();
System.out.println(key + ":" + value);
}
/*
* 遍历所有的value
* 遍历所有的value
* Collection values()
* 该方法会将当前map中所有的value存入一个集合后返回
*/
Collection<Integer> values=map.values();
for(Integer value:values){
System.out.println(value);
}
/**
* jdk1.8
*/
map.forEach((k,v)->{
System.out.println("key : " + k + "; value : " + v);
});
}
Collection<Integer> values = map.values();
for (Integer value : values) {
System.out.println(value);
}
/*
* jdk1.8
*/
map.forEach((k, v) -> System.out.println("key : " + k + "; value : " + v));
}
}
boot-service/src/main/java/com/xwbing/demo/demo.java
+6 -13
View File
@@ -2,7 +2,6 @@ package com.xwbing.demo;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
/**
@@ -13,20 +12,14 @@ import java.util.concurrent.ExecutionException;
*/
public class demo {
public static void main(String[] args) throws ExecutionException, InterruptedException {
String s="001";
Integer integer = Integer.valueOf(s);
System.out.println(integer);
List<Integer> list = new ArrayList<>();
for (int i = 0; i < 100; i++) {
for (int i = 0; i < 20; i++) {
list.add(i);
}
int size = list.size();
CompletableFuture[] futures = new CompletableFuture[size];
List<Integer> finalList = new ArrayList<>();
for (int i = 0; i < size; i++) {
finalList.add(null);
Integer integer = list.get(i);
int finalI = i;
futures[i] = CompletableFuture.supplyAsync(() -> finalList.set(finalI, integer));
}
CompletableFuture.allOf(futures).join();
System.out.println(finalList);
}
}