personal.java

JAVA实现的数据结构

import java.io.*;

public class Personal extends DbObject {
    protected final int nameLen = 10, cityLen = 10;
    protected String name, city;
    protected int SSN, year;
    protected long salary;
    protected final int size = 4 + nameLen*2 + cityLen*2 + 4 + 8;
    Personal() {
    }
    Personal(int ssn, String n, String c, int y, long s) {
        SSN = ssn; name = n; city = c; year = y; salary = s;
    }
    public int size() {
        return size;
    }
    public boolean equals(Object pr) {
        return SSN == ((Personal)pr).SSN;
    }
    public void writeToFile(RandomAccessFile out) throws IOException {
        out.writeInt(SSN);
        writeString(name,out);
        writeString(city,out);
        out.writeInt(year);
        out.writeLong(salary);
    }
    public void writeLegibly() {
        System.out.print("SSN = " + SSN + ", name = " + name.trim()
                + ", city = " + city.trim() + ", year = " + year
                + ", salary = " + salary);
    }
    public void readFromFile(RandomAccessFile in) throws IOException {
        SSN = in.readInt();
        name = readString(nameLen,in);
        city = readString(cityLen,in);
        year = in.readInt();
        salary = in.readLong();
    }
    public void readKey() {
        System.out.print("Enter SSN: ");
        SSN = kb.nextInt();
    }
    public void readFromConsole() {
        System.out.print("Enter SSN: ");
        SSN = kb.nextInt();
        System.out.print("Name: ");
        name = kb.next();
        for (int i = name.length(); i < nameLen; i++)
            name += ' '; 
        System.out.print("City: ");
        city = kb.next();
        for (int i = city.length(); i < cityLen; i++)
            city += ' '; 
        System.out.print("Birthyear: ");
        year = kb.nextInt();
        System.out.print("Salary: ");
        salary = kb.nextLong();
    }
    public void copy(DbObject[] d) {
        d[0] = new Personal(SSN,name,city,year,salary);
    }
}