數組初始化

1.數組只是相同類型的，用一個標示符名稱封裝到一起的一個對象序列或基本類型數據序列，數組只是通過方括號下標操作符【】來定義和使用的。 int[] aq;

2.編譯器不允許我們指定數組的大小，在java中可以將一個數組賦值給另一個數組，a1=a2；

//: initialization/ArrayNew.java
// Creating arrays with new.
import java.util.*;
import static net.mindview.util.Print.*;

public class ArrayNew {
  public static void main(String[] args) {
    int[] a;
    Random rand = new Random(47);
    a = new int[rand.nextInt(20)];
    print("length of a = " + a.length);
    print(Arrays.toString(a));
  }
} /* Output:
length of a = 18
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
*///:~

//: initialization/ArrayClassObj.java
// Creating an array of nonprimitive objects.
import java.util.*;
import static net.mindview.util.Print.*;

public class ArrayClassObj {
  public static void main(String[] args) {
    Random rand = new Random(47);
    Integer[] a = new Integer[rand.nextInt(20)];
    print("length of a = " + a.length);
    for(int i = 0; i < a.length; i++)
      a[i] = rand.nextInt(500); // Autoboxing
    print(Arrays.toString(a));
  }
} /* Output: (Sample)
length of a = 18
[55, 193, 361, 461, 429, 368, 200, 22, 207, 288, 128, 51, 89, 309, 278, 498, 361, 20]
*///:~