我编写了一个程序,该程序会生成一个随机整数数组,并且如果用户尝试添加整数,则大小会加倍。示例:1|2|3|4 如果他们要添加另一个 int,它将看起来像 1|2|3|4|5|0|0|0。我已经制作了一种添加有效 int 的方法,但现在我正在尝试制作删除某个 int 之一的方法和另一个删除所有某个 int 的方法。例如,removeInt(3) 会给我 1|2|0|4|5|0|0|0。我让第一部分工作,以便它将零移到末尾,就像这样 1|2|4|5|0|0|0|0 但无法让它工作多个相同的值。有什么建议吗?
// ****************************************************************
// IntegerList.java
//
// Define an IntegerList class with methods to create & fill
// a list of integers.
//
// ****************************************************************
public class IntegerList
{
int[] list; //values in the list
//-------------------------------------------------------
//create a list of the given size
//-------------------------------------------------------
public IntegerList(int size)
{
list = new int[size];
}
//-------------------------------------------------------
//fill array with integers between 1 and 100, inclusive
//-------------------------------------------------------
public void randomize()
{
for (int i=0; i<list.length; i++)
list[i] = (int)(Math.random() * 100) + 1;
}
//-------------------------------------------==----------
//print array elements with indices
//-------------------------------------------------------
public void print()
{
for (int i=0; i<list.length; i++)
System.out.println(i + ":\t" + list[i]);
}
public void addElement(int newVal){
boolean full = true;
System.out.println(list.length);
int position = 0;
int place;
while(position < list.length){
System.out.println("HERE");
if(list[position]==0){
System.out.println("here");
full = false;
place = position;
System.out.println(place);
}
position = position+1;
}
if(full == true){
list = increaseSize(list);
System.out.println("L"+list.length);
full = false;
}
for(int i = 0;i<list.length;i++){
if(list[i]==0){
if(i<position){
position = i;
System.out.println(list.length);
}
}
}
list[position] = newVal;
}
public void removeFirst(int newVal){
int position = 0;
boolean removed = false;
for(int i = 0; i<list.length;i++){
if(list[i] == newVal){
list[i]=0;
position = i;
removed = true;
break;
}
}
if(removed==true){
for(int i = position;i<list.length;i++){
if(i!=list.length-1){
list[i]=list[i+1];
}
}
list[list.length-1]= 0;
}
}
public void removeAll(int newVal){
int position = 0;
boolean removed = false;
for(int i = 0; i<list.length;i++){
if(list[i] == newVal){
list[i]=0;
position = i;
removed = true;
}
}
if(removed==true){
for(int i = 0;i<list.length;i++){
if(i!=list.length-1 && list[i+1]==newVal){
list[i]=0;
}
if(list[i]==newVal){
list[i]=0;
}
}
}
}
public static int[] increaseSize(int[] x){
int newLength = x.length *2;
int[] newx = new int[newLength];
for(int i = 0; i<x.length; i++){
newx[i] = x[i];
}
return newx;
}
public static int[] halfSize(int[] x){
int[] newx = new int[x.length / 2];
for(int i = 0; i<x.length; i++){
newx[i] = x[i];
}
return newx;
}
}
最佳答案
我相信有一种更简单的方法来实现您的 removeAll
方法。在数组中移动 2 个(而不是 1 个)索引,不断移动要删除的项目上的值;
int dest = 0;
int source = 0;
while (source < array.length) {
if (array[dest] != valueToRemove)
dest++;
array[dest] = array[source++];
}
while (dest < array.length) {
array[dest++] = 0;
}
关于java - 删除值后移动数组 (Java),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28308965/