java 数组
最后更新于：2022-04-02 02:18:07
[TOC]
## 基础
1. 声明数组
```java
int[] scores; //整数数组
int scores[]; //整数数组
double height[]; //浮点数数组
String[] names; //字符串数组
```
2. 分配空间
```java
scores = new int[5]
height = new double[5];
names = new Stringp[5];
```
3. 在声明数组的同时为它分配空间
```java
int[] scores = new int[5];
```
4. 直接创建数组
```java
int[] scores = {78,91,83,68};
int score[] = new int[] { 34, 90, 87, 54, 24 };
```
5. 赋值
```java
scores[0]=89;
scores[1]=90;
```
## Arrays 类
```java
import java.util.Arrays; //引入
String[] hobbies = { "sports", "game", "movie" };
Arrays.sort(hobbies);
Arrays.toString(hobbies); //[game, movie, sports]
```
## foreach 方法
```java
int[] scores = {56,23,89,45};
sum=0;
for (int score : scores){
System.out.println(score);
System.out.println("数组索引"+sum);
sum++;
}
```
## 二维数组
```java
//声明2行3列的二维数组
int[][] num = new int[2][3];
//声明并赋值
String[][] names={{"tom","jack","mike"},{"zhangsan","lisi","wangwu"}};
取值
names[1][2];
```
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