[英]File I/O in Java
我自己的Vector類的代碼有問題。
已修正 。 添加了對文件的讀寫功能,但是這種嘗試/捕獲對我來說太麻煩了。 也許有更好的文件I / O方式?
FIXED-2哦,我剛剛發現了“ throws”,現在我的代碼看起來非常不錯。 謝謝大家的幫助! 這是Stack.java的最終版本:
import java.util.Scanner;
import java.io.*;
class Vector {
private int[] vec;
private int length, pointer;
public Vector(int n) {
pointer = 0;
length = n;
vec = new int[length];
}
public int get(int i) {
return vec[i];
}
public void set(int i, int n) {
vec[i] = n;
}
public void push(int n) {
if (pointer == length) {
int[] nvec = new int[length*2];
for (int i = 0; i < length; i++)
nvec[i] = vec[i];
length *= 2;
vec = null;
vec = nvec;
}
vec[pointer++] = n;
}
public void delete() {
pointer--;
if (pointer == length / 4) {
int[] nvec = new int[length/2];
for (int i = 0; i <= pointer; i++)
nvec[i] = vec[i];
length /= 2;
vec = null;
vec = nvec;
}
}
public int size() {
return pointer;
}
public int actualSize() {
return length;
}
}
public class Stack {
public static void main(String[] args) throws IOException {
File ifile = new File("stack1.in");
BufferedReader reader = new BufferedReader(new FileReader(ifile));
File ofile = new File("stack1.out");
BufferedWriter writer = new BufferedWriter(new FileWriter(ofile));
int n = Integer.parseInt(reader.readLine());
Vector stack = new Vector(10);
for (int i = 0; i < n; i++) {
String s = reader.readLine();
if (s.charAt(0) == '-') {
writer.write(Integer.toString(stack.get(stack.size()-1)));
writer.write("\n");
stack.delete();
} else {
s = s.substring(2);
stack.push(Integer.parseInt(s));
}
}
writer.close();
reader.close();
}
}
您的語法錯誤。 也許您的意思是這樣的:
Vector stack = new Vector(10);
另外,您確定要在堆棧類中包含Vector類嗎? 同樣,將類命名為與現有Java類相同的名稱通常也是個壞主意。
如下初始化Vector類
Vector stack = new Vector(10);
Vector stack = new Vector(10);
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