FilesExpand file tree

 master

/

ArrayOptions.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

executable file

·

68 lines (66 loc) · 2.07 KB

 master

/

ArrayOptions.java

Copy path

Top

File metadata and controls

• Code
• Blame

executable file

·

68 lines (66 loc) · 2.07 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

//: arrays/ArrayOptions.java

package arrays; /* Added by Eclipse.py */

// Initialization & re-assignment of arrays.

import java.util.*;

import static net.mindview.util.Print.*;

public class ArrayOptions {

public static void main(String[] args) {

// Arrays of objects:

BerylliumSphere[] a; // Local uninitialized variable

BerylliumSphere[] b = new BerylliumSphere[5];

// The references inside the array are

// automatically initialized to null:

print("b: " + Arrays.toString(b));

BerylliumSphere[] c = new BerylliumSphere[4];

for(int i = 0; i < c.length; i++)

if(c[i] == null) // Can test for null reference

c[i] = new BerylliumSphere();

// Aggregate initialization:

BerylliumSphere[] d = { new BerylliumSphere(),

new BerylliumSphere(), new BerylliumSphere()

};

// Dynamic aggregate initialization:

a = new BerylliumSphere[]{

new BerylliumSphere(), new BerylliumSphere(),

};

// (Trailing comma is optional in both cases)

print("a.length = " + a.length);

print("b.length = " + b.length);

print("c.length = " + c.length);

print("d.length = " + d.length);

a = d;

print("a.length = " + a.length);

// Arrays of primitives:

int[] e; // Null reference

int[] f = new int[5];

// The primitives inside the array are

// automatically initialized to zero:

print("f: " + Arrays.toString(f));

int[] g = new int[4];

for(int i = 0; i < g.length; i++)

g[i] = i*i;

int[] h = { 11, 47, 93 };

// Compile error: variable e not initialized:

//!print("e.length = " + e.length);

print("f.length = " + f.length);

print("g.length = " + g.length);

print("h.length = " + h.length);

e = h;

print("e.length = " + e.length);

e = new int[]{ 1, 2 };

print("e.length = " + e.length);

}

} /* Output:

b: [null, null, null, null, null]

a.length = 2

b.length = 5

c.length = 4

d.length = 3

a.length = 3

f: [0, 0, 0, 0, 0]

f.length = 5

g.length = 4

h.length = 3

e.length = 3

e.length = 2

*///:~