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algo/java/05_array/Array.java at master · open-source-backup/algo · GitHub
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05_array
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Array.java
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05_array
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Array.java
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package
array
;
/**
* 1) 数组的插入、删除、按照下标随机访问操作;
* 2)数组中的数据是int类型的;
*
* Author: Zheng
* modify: xing
*/
public
class
Array
{
//定义整型数据data保存数据
public
int
data
[];
//定义数组长度
private
int
n
;
//定义中实际个数
private
int
count
;
//构造方法,定义数组大小
public
Array
(
int
capacity
){
this
.
data
=
new
int
[
capacity
];
this
.
n
=
capacity
;
this
.
count
=
0
;
//一开始一个数都没有存所以为0
}
//根据索引,找到数据中的元素并返回
public
int
find
(
int
index
){
if
(
index
<
0
||
index
>=
count
)
return
-
1
;
return
data
[
index
];
}
//插入元素:头部插入,尾部插入
public
boolean
insert
(
int
index
,
int
value
){
//数组中无元素
//if (index == count && count == 0) {
// data[index] = value;
// ++count;
// return true;
//}
// 数组空间已满
if
(
count
==
n
) {
System
.
out
.
println
(
"没有可插入的位置"
);
return
false
;
}
// 如果count还没满,那么就可以插入数据到数组中
// 位置不合法
if
(
index
<
0
||
index
>
count
) {
System
.
out
.
println
(
"位置不合法"
);
return
false
;
}
// 位置合法
for
(
int
i
=
count
;
i
>
index
; --
i
){
data
[
i
] =
data
[
i
-
1
];
}
data
[
index
] =
value
;
++
count
;
return
true
;
}
//根据索引,删除数组中元素
public
boolean
delete
(
int
index
){
if
(
index
<
0
||
index
>=
count
)
return
false
;
//从删除位置开始,将后面的元素向前移动一位
for
(
int
i
=
index
+
1
;
i
<
count
; ++
i
){
data
[
i
-
1
] =
data
[
i
];
}
//删除数组末尾元素 这段代码不需要也可以
/*int[] arr = new int[count-1];
for (int i=0; i<count-1;i++){
arr[i] = data[i];
}
this.data = arr;*/
--
count
;
return
true
;
}
public
void
printAll
() {
for
(
int
i
=
0
;
i
<
count
; ++
i
) {
System
.
out
.
print
(
data
[
i
] +
" "
);
}
System
.
out
.
println
();
}
public
static
void
main
(
String
[]
args
) {
ArrayOperate
array
=
new
ArrayOperate
(
5
);
array
.
printAll
();
array
.
insert
(
0
,
3
);
array
.
insert
(
0
,
4
);
array
.
insert
(
1
,
5
);
array
.
insert
(
3
,
9
);
array
.
insert
(
3
,
10
);
//array.insert(3, 11);
array
.
printAll
();
}
}
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