Create a sequential list

    static final int MAXLEN=100;
    
    class DATA{
        String key;
        String name;
        int age;
    }
    class SLType
    {
        DATA[] ListData = new DATA[MAXLEN+1];
        int ListLen;
    }

Initialize sequential list

void SLInit(SLType SL) //Initialize sequential list
    {
        SL.ListLen = 0; 
    }

Insert an element in proper position

int SLInsert (SLType SL, int n, DATA data)
    {
        // n is the insert position
        int i; 
        if (SL.ListLen >= MAXLEN)
        {
            System.out.println("SL is full,cannot insert new element");
            return 0;
        }
        if (n<0 || n>SL.ListLen) 
        {
            System.out.println("wrong position!")
            return 0;
        }
        for (i=SL.ListLen;i>=n;i--)
        {
            SL.ListData[i+1]=SL.ListData[i];
        }
        SL.ListData[n]=data;
        SL.ListLen++;
        return 1;
    }

Add new element in the last of list

int SLAdd(SLType SL, DATA data)
    {
        if(SL.ListLen>=MAXLEN)
        {
            System.out.println("SL is full");
            return 0;
        }else
            SL.ListData[SL.ListLen++]=data;
        return 1;
    }

Delete element

int SLDelete(SLType SL, int n)
    {
        int i;
        if(n<0 || n>SL.ListLen)
        {
            System.out.println("wrong position");
            return 0;
        }
        for(i=n; i<SL.ListLen;i++)
        {
            SL.ListData[i]=SL.ListData[i++];
        }
        SL.ListLen--;
        return 1;
    }

Search element which value is x

1. Search with index:

DATA SLFindByIndex(SLType SL, int n)
    {
        if (n<0 || n>SL.ListLen)
        {
            System.out.println("wrong index");
            return null;
        }
        return SL.ListData[n];
    }

2. Search with keyword

int  SLFindByKey(SLType SL, String word)
    {
        int i;
        for(i=0;i<=SL.ListLen;i++)
        {
            if (SL.ListData[i].key.compareTo(word)==0)
            {
                return i;
            }
        }
        return 0;
    }

Display all elements

int SLDisplay(SLType SL)
    {
        int i;
        for (i=0; i<=SL.ListLen;i++)
        {
            System.out.printf("(%s,%s,%d)\n",SL.ListData[i].key,
                    SL.ListData[i].name,SL.ListData[i].age);
        }
        return 0;
    }