java变长数组示例，java数组示例,package cn.o

java变长数组示例，java数组示例,package cn.o

package cn.outofmemory.snippets.core;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.PipedInputStream;import java.io.PipedOutputStream;import java.io.Serializable;class SerialIntList implements Serializable {    protected int[] intArray = new int[8];    protected transient int length = 0;    public int get(int ind) {        if (ind >= length) {            throw new ArrayIndexOutOfBoundsException(ind);        } else {            return intArray[ind];        }    }    public void add(int i) {        if (intArray.length == length) {            resize(intArray.length * 2);         }        intArray[length++] = i;     }    protected void resize(int size) {        int[] newdata = new int[size];         System.arraycopy(intArray, 0, newdata, 0, length); // Copy array elements.        intArray = newdata; // Replace old array    }    private void writeObject(ObjectOutputStream out) throws IOException {        if (intArray.length > length) {            resize(length); // Compact the array.        }        out.defaultWriteObject(); // Then write it out normally.    }    @Override    public boolean equals(Object o) {        if (!(o instanceof SerialIntList)) {            return false;        }        SerialIntList that = (SerialIntList) o;        if (this.length != that.length) {            return false;        }        for (int i = 0; i < this.length; i++) {            if (this.intArray[i] != that.intArray[i]) {                return false;            }        }        return true;    }    @Override    public int hashCode() {        int code = 1;         for (int i = 0; i < length; i++) {            code = code * 997 + intArray[i];        }        return code;    }}public class Main {    static void store(Serializable o, File f) throws IOException {        ObjectOutputStream ostream = new ObjectOutputStream(new FileOutputStream(f));        ostream.writeObject(o);         ostream.close();    }    static Object load(File f) throws IOException, ClassNotFoundException {        ObjectInputStream instream =  new ObjectInputStream(new FileInputStream(f));        return instream.readObject();     }    static Object deepclone(final Serializable o) throws IOException, ClassNotFoundException {        final PipedOutputStream pipeout = new PipedOutputStream();        PipedInputStream pipein = new PipedInputStream(pipeout);        Thread writer = new Thread() {            @Override            public void run() {                ObjectOutputStream out = null;                try {                    out = new ObjectOutputStream(pipeout);                    out.writeObject(o);                } catch (IOException e) {                } finally {                    try {                        out.close();                    } catch (Exception e) {                    }                }            }        };        // Start serializing and writing        writer.start();        ObjectInputStream in = new ObjectInputStream(pipein);        return in.readObject();    }    static class DataStructure implements Serializable {        String message;        int[] data;        DataStructure other;        @Override        public String toString() {            String s = message;            for (int i = 0; i < data.length; i++) {                s += " " + data[i];            }            if (other != null) {                s += "\n\t" + other.toString();            }            return s;        }    }    public static void main(String[] args) throws IOException, ClassNotFoundException {        DataStructure structure = new DataStructure();        structure.message = "Java Code Geeks rocks!";        structure.data = new int[]{1, 2, 3, 4, 5};        structure.other = new DataStructure();        structure.other.message = "JavaCodeGeeks is the best!";        structure.other.data = new int[]{9, 8, 7};        System.out.println("Data: " + structure);        File f = new File("C:/Users/nikos7/Desktop/output2.txt");        System.out.println("Save to file");        Main.store(structure, f);        structure = (DataStructure) Main.load(f);        System.out.println("Read : " + structure);        DataStructure ds2 = (DataStructure) Main.deepclone(structure);        structure.other.message = null;        structure.other.data = null;         System.out.println("Deepcloning: " + ds2);    }}

输出：

Data: Java Code Geeks rocks! 1 2 3 4 5    JavaCodeGeeks is the best! 9 8 7Save to fileRead : Java Code Geeks rocks! 1 2 3 4 5    JavaCodeGeeks is the best! 9 8 7Deepcloning: Java Code Geeks rocks! 1 2 3 4 5    JavaCodeGeeks is the best! 9 8 7