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891天前1.主程序 |
package s1210Arraylist队列; |
public class Arraylist implements List { |
private Object[] data = new Object[0]; |
public void add(Object x) { |
Object[] data2 = new Object[data.length + 1]; |
if (data.length >= 1) { |
for (int i = 0; i < data.length; i++) { |
data2[i] = data[i]; |
} |
} |
data2[data.length] = x; |
data = data2; |
} |
public Object remove(int y) { |
if (y < 0 || y >= data.length) { |
System.out.println("数组越界了"); |
return null; |
} |
else { |
Object[] data2 = new Object[data.length - 1]; |
for (int i = 0; i < y; i++) |
data2[i] = data[i]; |
for (int i = y + 1; i < data.length; i++) |
data2[i - 1] = data[i]; |
Object t; |
t = data[y]; |
data = data2; |
return t; |
} |
} |
public void insert(Object x, int y) { |
if (y < 0 || y > data.length) { |
System.out.println("数组越界了"); |
} else { |
Object[] data2 = new Object[data.length + 1]; |
data2[y - 1] = x; |
for (int i = 0; i < y - 1; i++) |
data2[i] = data[i]; |
for (int i = y - 1; i < data.length; i++) |
data2[i + 1] = data[i]; |
data = data2; |
} |
} |
public Object get(int x) { |
return data[x]; |
} |
public int size() { |
return data.length; |
} |
} |
2.List接口 |
package s1210Arraylist队列; |
public interface List { |
public void add(Object x); |
public Object remove(int x); |
public void insert(Object x,int y); |
public int size(); |
public Object get(int x); |
} |
3.测试类 |
package s1210Arraylist队列; |
public class Text { |
public static void main(String[] args) { |
List s=new Arraylist(); |
|
for(int i=0;i<10;i++) |
{ s.add("str"+i);} |
|
System.out.println(); |
|
s.insert("str11",3); |
System.out.println("size="+s.size()); |
|
for(int i=0;i<s.size();i++) |
{System.out.println(s.get(i));} |
} |
} |
