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Java/src/main/java/com/examplehub/basics/Array.java at master · JavaCimcoz/Java · GitHub
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com
/
examplehub
/
basics
/
Array.java
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Java
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src
/
main
/
java
/
com
/
examplehub
/
basics
/
Array.java
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package
com
.
examplehub
.
basics
;
import
java
.
util
.
Arrays
;
public
class
Array
{
public
static
void
main
(
String
[]
args
) {
int
[]
numbers
= {
1
,
2
,
3
,
4
,
5
};
/*
* numbers[0] = 1
* numbers[1] = 2
* numbers[2] = 3
* numbers[3] = 4
* numbers[4] = 5
*/
System
.
out
.
println
(
"numbers[0] = "
+
numbers
[
0
]);
System
.
out
.
println
(
"numbers[1] = "
+
numbers
[
1
]);
System
.
out
.
println
(
"numbers[2] = "
+
numbers
[
2
]);
System
.
out
.
println
(
"numbers[3] = "
+
numbers
[
3
]);
System
.
out
.
println
(
"numbers[4] = "
+
numbers
[
4
]);
/*
* array index is out of bounds
*/
// System.out.println(numbers[-1]);
// System.out.println(numbers[5]);
/*
* numbers[0] = 1
* numbers[1] = 2
* numbers[2] = 3
* numbers[3] = 4
* numbers[4] = 5
*/
for
(
int
i
=
0
;
i
<
5
;
i
++) {
System
.
out
.
println
(
"numbers["
+
i
+
"] = "
+
numbers
[
i
]);
}
/*
* length of numbers = 5
*/
System
.
out
.
println
(
"length of numbers = "
+
numbers
.
length
);
/*
* numbers[0] = 1
* numbers[1] = 2
* numbers[2] = 3
* numbers[3] = 4
* numbers[4] = 5
*/
for
(
int
i
=
0
;
i
<
numbers
.
length
;
i
++) {
System
.
out
.
println
(
"numbers["
+
i
+
"] = "
+
numbers
[
i
]);
}
/*
* numbers[4] = 5
* numbers[3] = 4
* numbers[2] = 3
* numbers[1] = 2
* numbers[0] = 1
*/
for
(
int
i
=
numbers
.
length
-
1
;
i
>=
0
;
i
--) {
System
.
out
.
println
(
"numbers["
+
i
+
"] = "
+
numbers
[
i
]);
}
/*
* 12345
*/
for
(
int
number
:
numbers
) {
System
.
out
.
print
(
number
);
}
System
.
out
.
println
();
/*
* [1, 2, 3, 4, 5]
*/
System
.
out
.
println
(
Arrays
.
toString
(
numbers
));
String
[]
company
= {
"Google"
,
"Facebook"
,
"Amazon"
,
"Microsoft"
};
/*
* company[0] = Google
* company[1] = Facebook
* company[2] = Amazon
* company[3] = Microsoft
*/
for
(
int
i
=
0
;
i
<
company
.
length
;
i
++) {
System
.
out
.
println
(
"company["
+
i
+
"] = "
+
company
[
i
]);
}
/*
* Google
* Facebook
* Amazon
* Microsoft
*/
for
(
String
c
:
company
) {
System
.
out
.
println
(
c
);
}
/*
* [Google, Facebook, Amazon, Microsoft]
*/
System
.
out
.
println
(
Arrays
.
toString
(
company
));
int
[][]
twoDimensionalNumbers
= {
{
1
,
2
,
3
},
{
4
,
5
,
6
,
7
},
{
8
,
9
},
{
10
,
11
,
12
,
13
,
14
,
15
}
};
/*
* total rows = 4
*/
System
.
out
.
println
(
"total rows = "
+
twoDimensionalNumbers
.
length
);
/*
* row 0 length = 3
* row 1 length = 4
* row 2 length = 2
* row 3 length = 6
*/
for
(
int
i
=
0
;
i
<
twoDimensionalNumbers
.
length
;
i
++) {
System
.
out
.
println
(
"row "
+
i
+
" length = "
+
twoDimensionalNumbers
[
i
].
length
);
}
/*
* row 0 = 1 2 3
* row 1 = 4 5 6 7
* row 2 = 8 9
* row 3 = 10 11 12 13 14 15
*/
for
(
int
i
=
0
;
i
<
twoDimensionalNumbers
.
length
;
i
++) {
System
.
out
.
print
(
"row "
+
i
+
" = "
);
for
(
int
j
=
0
;
j
<
twoDimensionalNumbers
[
i
].
length
;
j
++) {
System
.
out
.
print
(
twoDimensionalNumbers
[
i
][
j
] +
" "
);
}
System
.
out
.
println
();
}
/*
* row 0 = [1, 2, 3]
* row 1 = [4, 5, 6, 7]
* row 2 = [8, 9]
* row 3 = [10, 11, 12, 13, 14, 15]
*/
for
(
int
i
=
0
;
i
<
twoDimensionalNumbers
.
length
;
i
++) {
System
.
out
.
println
(
"row "
+
i
+
" = "
+
Arrays
.
toString
(
twoDimensionalNumbers
[
i
]));
}
/*
* 1 2 3
* 4 5 6 7
* 8 9
* 10 11 12 13 14 15
*/
for
(
int
[]
ints
:
twoDimensionalNumbers
) {
for
(
int
num
:
ints
) {
System
.
out
.
print
(
num
+
" "
);
}
System
.
out
.
println
();
}
/*
* [1, 2, 3]
* [4, 5, 6, 7]
* [8, 9]
* [10, 11, 12, 13, 14, 15]
*/
for
(
int
[]
ints
:
twoDimensionalNumbers
) {
System
.
out
.
println
(
Arrays
.
toString
(
ints
));
}
int
length
=
5
;
int
[]
array
=
new
int
[
length
];
for
(
int
i
=
0
;
i
<
5
;
i
++) {
array
[
i
] =
i
+
1
;
}
/*
* [1, 2, 3, 4, 5]
*/
System
.
out
.
println
(
Arrays
.
toString
(
array
));
}
}
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