# 一維陣列

> 陣列可以存放相同的資料型態資料，並利用索引值存取其內容。

### 一、宣告方式

必須先宣告陣列後配置記憶體位置給陣列。

```
資料型態 陣列名稱[];
陣列名稱＝new 資料型態[數量];
```

```
int score[];   //宣告整數陣列score
score=new int[5]; //使陣列score 可存放5個整數的記憶體空間
```

#### 較簡潔的方式：

```
資料型態 陣列名稱[]＝new 資料型態[數量];
```

 `int score[ ];` 還有另外的宣告方式：

```
int[] score;
int  []score;
```

### 二、取得陣列長度 length

```
public class ch06_1 {

	public static void main(String[] args) {
		int i;
		int a[];
		a=new int[3];
		a[0]=9;
		a[1]=6;

		for(i=0; i<a.length; i++)
			System.out.print("a["+i+"]="+a[i]+",\t");
		System.out.println("字串長度："+a.length);


	}
```

OUTPUT：\
a\[0]=9, a\[1]=6, a\[2]=0, 字串長度：3

### 三、陣列設初值

```
陣列名稱[]＝{1,2,3};
```

```
public class ch06_2 {

	public static void main(String[] args) {
		int i;
		int a[]={10,20,30}; //自動依序指定給第0,第1,第2個元素


		for(i=0; i<a.length; i++)
			System.out.println("a["+i+"]="+a[i]);
		System.out.println("字串長度："+a.length);

	}
```

OUTPUT：\
a\[0]=10\
a\[1]=20\
a\[2]=30\
字串長度：3

### 四、尋找陣列中最大最小值

```
public class ch06_3 {

	public static void main(String[] args) {
		int i,min,max;
		int a[]={22,15,89,74,3};  //給定陣列初值
		min=max=a[0];   //先將min,max 分別設為陣列第一個元素
		for(i=0; i<a.length; i++)
                {
                    System.out.print(a[i]+" "); //印出陣列
                    if(a[i]>max) //如果第i個元素 比max大(一開始將max設為第0個元素)
			max=a[i]; // 則將a[i]設為max
		    if(a[i]<min)
			min=a[i];  //min 同理
		}
		System.out.println("\nmax= "+max);
		System.out.println("min= "+min);

	}
```

OUTPUT：\
22 15 89 74 3\
max= 89\
min= 3


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