通过Netbeans编译，不通过CMD编译
我有我的代码来处理存储管理 页面替换方法分配。我的代码通过Netbeans工作，但它不能通过CMD编译。
你知道为什么吗？
public class Paging {
/**
* @param args the command line arguments
*/
public static void main(String[] args) throws IOException, IOException, IOException, IOException {
BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));
try {
URL url = new URL("www.csc.liv.ac.uk/~ped/COMP104/COMP104-2016-17/Page_Trace_Oldest");
URL url3 = new URL("www.csc.liv.ac.uk/~ped/COMP104/COMP104-2016-17/Page_Trace_Random");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String str;
while ((str = in.readLine()) != null) {
str = in.readLine().toString();
System.out.println(str);
}
in.close();
} catch (MalformedURLException e) {
} catch (IOException e) {
}
URL url2 = new URL("www.csc.liv.ac.uk/~ped/COMP104/COMP104-2016-17/Page_Trace_LRU");
BufferedReader in = new BufferedReader(new InputStreamReader(url2.openStream()));
String str2;
while ((str2 = in.readLine()) != null) {
str2 = in.readLine().toString();
System.out.println(str2);
}
in.close();
URL url3 = new URL("www.csc.liv.ac.uk/~ped/COMP104/COMP104-2016-17/Page_Trace_Random");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String str3;
while ((str3 = in.readLine()) != null) {
str2 = in.readLine().toString();
System.out.println(str3);
}
in.close();
int f, page = 0, ch, pgf = 0, n = 0, chn = 0;
boolean flag;
int pages[];
do {
System.out.println("Menu");
System.out.println("1.FIFO");
System.out.println("2.LRU");
System.out.println("3.LFU");
System.out.println("4.EXIT");
System.out.println("ENTER YOUR CHOICE: ");
try {
ch = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
switch (ch) {
case 1:
int pt = 0;
System.out.println("Enter no. of frames (1-8): ");
f = Integer.parseInt(obj.readLine());
int frame[] = new int[f];
for (int i = 0; i < f; i++) {
frame[i] = -1;
}
System.out.println("enter the no of pages ");
n = Integer.parseInt(obj.readLine());
pages = new int[n];
System.out.println("enter the page no ");
for (int j = 0; j < n; j++) {
pages[j] = Integer.parseInt(obj.readLine());
}
do {
int pg = 0;
for (pg = 0; pg < n; pg++) {
page = pages[pg];
flag = true;
for (int j = 0; j < f; j++) {
if (page == frame[j]) {
flag = false;
break;
}
}
if (flag) {
frame[pt] = page;
pt++;
if (pt == f) {
pt = 0;
}
System.out.print("frame :");
for (int j = 0; j < f; j++) {
System.out.print(frame[j] + " ");
}
System.out.println();
pgf++;
} else {
System.out.print("frame :");
for (int j = 0; j < f; j++) {
System.out.print(frame[j] + " ");
}
System.out.println();
}
chn++;
}
} while (chn != n);
System.out.println("Page fault:" + pgf);
break;
case 2:
int k = 0;
System.out.println("enter no. of frames: ");
{
try {
f = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
}
int frame1[] = new int[f];
int a[] = new int[f];
int b[] = new int[f];
for (int i = 0; i < f; i++) {
frame1[i] = -1;
a[i] = -1;
b[i] = -1;
}
System.out.println("enter the no of pages ");
{
try {
n = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
}
pages = new int[n];
System.out.println("enter the page no ");
for (int j = 0; j < n; j++) {
try {
pages[j] = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
}
do {
int pg = 0;
for (pg = 0; pg < n; pg++) {
page = pages[pg];
flag = true;
for (int j = 0; j < f; j++) {
if (page == frame1[j]) {
flag = false;
break;
}
}
for (int j = 0; j < f && flag; j++) {
if (frame1[j] == a[f - 1]) {
k = j;
break;
}
}
if (flag) {
frame1[k] = page;
System.out.println("frame :");
for (int j = 0; j < f; j++) {
System.out.print(frame1[j] + " ");
}
pgf++;
System.out.println();
} else {
System.out.println("frame :");
for (int j = 0; j < f; j++) {
System.out.print(frame1[j] + " ");
}
System.out.println();
}
int p = 1;
b[0] = page;
for (int j = 0; j < a.length; j++) {
if (page != a[j] && p < f) {
b[p] = a[j];
p++;
}
}
for (int j = 0; j < f; j++) {
a[j] = b[j];
}
chn++;
}
} while (chn != n);
System.out.println("Page fault:" + pgf);
break;
case 3:
k = 0;
pgf = 0;
int sml;
System.out.println("enter no. of frames: ");
{
try {
f = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
}
int frame2[] = new int[f];
int cnt[] = new int[f];
flag = true;
for (int i = 0; i < f; i++) {
frame2[i] = -1;
cnt[i] = 0;
}
System.out.println("enter the no of pages ");
{
try {
n = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
}
pages = new int[n];
System.out.println("enter the page no ");
for (int j = 0; j < n; j++) {
try {
pages[j] = Integer.parseInt(obj.readLine());
} catch (IOException ex) {
Logger.getLogger(Paging.class.getName()).log(Level.SEVERE, null, ex);
}
}
do {
int pg = 0;
for (pg = 0; pg < n; pg++) {
page = pages[pg];
flag = true;
for (int j = 0; j < f; j++) {
if (page == frame2[j]) {
flag = false;
cnt[j]++;
break;
}
}
if (flag) {
sml = cnt[0];
for (int j = 0; j < f; j++) {
if (cnt[j] < sml) {
sml = cnt[j];
break;
}
}
for (int j = 0; j < f; j++) {
if (sml == cnt[j]) {
frame2[j] = page;
k = j;
break;
}
}
cnt[k] = 1;
System.out.print("frame :");
for (int j = 0; j < f; j++) {
System.out.print(frame2[j] + " ");
System.out.println();
pgf++;
}
} else {
System.out.print("frame :");
for (int j = 0; j < f; j++) {
System.out.print(frame2[j] + " ");
}
System.out.println();
}
chn++;
}
} while (chn != n);
System.out.println("Page fault:" + pgf);
break;
case 4:
break;
}
} while (ch != 4);
}
}
我得到的错误是：
1 个答案:
答案 0 :(得分：1)
您正在创建2个具有相同名称的BufferedReader对象。
GtkToolItem*和
URL url2 = new URL("www.csc.liv.ac.uk/~ped/COMP104/COMP104-2016-17/Page_Trace_LRU");
BufferedReader in = new BufferedReader(new InputStreamReader(url2.openStream()));
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？