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所以，我正試圖完成一個程序，該程序創建一個可以將彙編語言轉換爲機器碼的GUI。這個程序需要7個類，但是我遇到困難的部分是當按下「Assemble」按鈕時，程序Assemble816在ASMEditor的actionlistener中運行。每當我嘗試不同的事情時，我都會收到一百個不同的錯誤。幾乎卡住了。如何在另一個類的ActionListener中調用Java類
ASMEditor：
public class ASMEditor extends JPanel {
private JTextArea editArea;
private JButton assembleButton;
private JButton clearButton;
private Assemble816 asm;
private InstructionMemory iMem;
public ASMEditor() {
super(new BorderLayout());
setBackground(Color.white);
Border blackLine = BorderFactory.createLineBorder(Color.black);
setBorder(
BorderFactory.createTitledBorder(blackLine, "Assembler"));
editArea = new JTextArea();
assembleButton = new JButton("Assemble");
assembleButton.setBackground(getBackground());
assembleButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
System.out.println(editArea.getText());
try{
Assemble816 asm = new Assemble816();
//this is all I have
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(null, ex.getMessage());
}
}
});
clearButton = new JButton("Clear");
clearButton.setBackground(getBackground());
clearButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
editArea.setText("");
}
});
JPanel buttons = new JPanel(new FlowLayout(FlowLayout.LEFT, 5, 5));
buttons.setBackground(Color.white);
buttons.add(assembleButton);
buttons.add(clearButton);
add(buttons, BorderLayout.NORTH);
Border blueLine = BorderFactory.createLineBorder(Color.blue);
editArea.setBorder(blueLine);
editArea.setBackground(new Color(205, 255, 255));
editArea.setFont(new Font("monospaced", Font.PLAIN, 14));
add(editArea, BorderLayout.CENTER);
}
}
和Assemble816：
public class Assemble816 {
private InstructionMemory im;
private static String[] twoOperand = {
"add", "adc", "sub", "xor", "and", "or", "lshift", "ashift"
};
private static int lookupTwoOp(String op) {
int opcode = 0;
for(String o : twoOperand) {
if (o.equals(op)) {
return opcode;
}
opcode++;
}
return -1;
}
private static String[] oneOperand = {
"inc", "dec", "asr", "lsl"
};
private static int lookupOneOp(String op) {
int opcode = 0;
for(String o : oneOperand) {
if (o.equals(op)) {
return opcode;
}
opcode++;
}
return -1;
}
private static String[] skip = {
"skipeq", "skipne", "skipge", "skiplt"
};
private static int lookupSkip(String op) {
int opcode = 0;
for(String o : skip) {
if (o.equals(op)) {
return opcode;
}
opcode++;
}
return -1;
}
private static String[] wordConstant = {
"ldc", "ldd", "std"
};
private static int lookupConstant(String op) {
int opcode = 0;
for(String o : wordConstant) {
if (o.equals(op)) {
return opcode;
}
opcode++;
}
return -1;
}
public Assemble816(final InstructionMemory im){
this.im = im;
}
private static void parseTwoArgs(Scanner sc, String [] words )
throws SyntaxError
{
String rest = sc.nextLine();
String[] ws = rest.split(",");
if (ws.length != 2) {
throw new SyntaxError("Missing words");
}
words[0] = ws[0].trim();
words[1] = ws[1].trim();
}
private static int parseRegister(String reg) throws SyntaxError {
if (reg.equals("r0")) {
return 0;
}
else if (reg.equals("r1")) {
return 1;
}
else if (reg.equals("r2")) {
return 2;
}
else if (reg.equals("r3")) {
return 3;
}
else {
throw new SyntaxError("Not a register: " + reg);
}
}
private static int parseInteger(String i) throws SyntaxError {
String ii = i;
try {
int sign = 1;
if (i.charAt(0) == '-') {
i = i.substring(1);
sign = -1;
}
int radix = 10;
if (i.startsWith("0x")) {
radix = 16;
i = i.substring(2);
}
else if (i.charAt(0) == '0') {
radix = 8;
}
return Integer.parseInt(i, radix) * sign;
}
catch(NumberFormatException ex) {
throw new SyntaxError("Not a number: " + ii);
}
}
private static String stripComments(String line) {
int split = line.indexOf(';');
if (split == -1) {
return line;
}
else {
return line.substring(0, split);
}
}
private void printIM(int address, int length) {
int dataPerLine = 0;
for (int a = address; a < (address+length); a++) {
if (dataPerLine == 0) {
System.out.printf("%04x", a&0xffff);
dataPerLine = 16;
}
System.out.printf(" %02x", im.fetch(a) & 0xff);
dataPerLine--;
if (dataPerLine == 0) {
System.out.println();
}
}
if (dataPerLine != 0) {
System.out.println();
}
}
// added for project, not part of assignment
public void assemble(File f) throws IOException, SyntaxError {
byte[] buf = new byte[(int) f.length()];
FileInputStream fis = new FileInputStream(f);
fis.read(buf);
fis.close();
assemble(new String(buf));
}
/**
* Assemble the file, f.
*/
public void assemble(String str) throws SyntaxError {
int currentPC = 0;
int opcode = 0;
String[] args = new String[2];
Scanner sc = new Scanner(str);
while(sc.hasNextLine()) {
Scanner parse = new Scanner(stripComments(sc.nextLine()));
if (!parse.hasNext()) continue; // skip empty line
String cmd = parse.next();
if (cmd.equals(".org")) {
if (!parse.hasNext()) {
throw new SyntaxError(".org excepting integer");
}
currentPC = parseInteger(parse.next());
}
else if (cmd.equals(".dump")) {
parseTwoArgs(parse, args);
int start = parseInteger(args[0]);
int length = parseInteger(args[1]);
printIM(start, length);
}
else if ((opcode=lookupConstant(cmd)) != -1) {
parseTwoArgs(parse, args);
int reg = parseRegister(args[0]);
int k = parseInteger(args[1]);
im.set(currentPC, (opcode<<2) | reg);
currentPC++;
im.set(currentPC, (k >> 8) & 0xff);
currentPC++;
im.set(currentPC, (k >> 0) & 0xff);
currentPC++;
}
else if ((opcode=lookupTwoOp(cmd)) != -1) {
parseTwoArgs(parse, args);
int dst = parseRegister(args[0]);
int src = parseRegister(args[1]);
im.set(currentPC, 0x80 | (opcode<<4) | dst << 2 | src);
currentPC++;
}
else if (cmd.equals("br")) {
if (!parse.hasNext()) {
throw new SyntaxError("br excepting integer");
}
int branch = parseInteger(parse.next());
im.set(currentPC, 0x40 | (branch & 0x3f));
currentPC++;
}
else if ((opcode=lookupOneOp(cmd)) != -1) {
if (!parse.hasNext()) {
throw new SyntaxError(cmd + " excepting register");
}
int ds = parseRegister(parse.next());
im.set(currentPC, 0x20 | (opcode<<2) | ds);
currentPC++;
}
else if ((opcode=lookupSkip(cmd)) != -1) {
if (!parse.hasNext()) {
throw new SyntaxError(cmd + " excepting register");
}
int ds = parseRegister(parse.next());
im.set(currentPC, 0x30 | (opcode<<2) | ds);
currentPC++;
}
else if (cmd.equals("ld")) {
parseTwoArgs(parse, args);
int index = parseRegister(args[0]);
if (index != 0 && index != 1) {
throw new SyntaxError("index register must be r0 or r1");
}
int ds = parseRegister(args[1]);
im.set(currentPC, 0x10 | (0<<3) | (index<<2) | ds);
currentPC++;
}
else if (cmd.equals("st")) {
parseTwoArgs(parse, args);
int index = parseRegister(args[0]);
if (index != 0 && index != 1) {
throw new SyntaxError("index register must be r0 or r1");
}
int ds = parseRegister(args[1]);
im.set(currentPC, 0x10 | (1<<3) | (index<<2) | ds);
currentPC++;
}
else if (cmd.equals("jl")) {
if (!parse.hasNext()) {
throw new SyntaxError("jl excepting register");
}
int link = parseRegister(parse.next());
im.set(currentPC, 0x0c | link);
currentPC++;
}
else {
throw new SyntaxError("unknown instruction: " + cmd);
}
}
sc.close();
}
/**
* main - accepts the name of the file to assemble on the command line.
*/
public static void main(String[] args) {
if (args.length != 1) {
System.out.println("usage: java Assemble816 file");
return;
}
try {
InstructionMemory im = new InstructionMemory();
Assemble816 asm = new Assemble816(im);
asm.assemble(new File(args[0]));
}
catch(IOException ex) {
System.out.println("io: " + ex.getMessage());
}
catch(SyntaxError ex) {
System.out.println("syntax: " + ex.getMessage());
}
}
}
一個參數那麼，爲什麼」你調用asm.assemble（editArea.getText（））; ？ – MadProgrammer 2013-02-21 21:28:28
我試過了，但我仍然收到錯誤：線程「AWT-EventQueue-0」中的異常java.lang.Error：未解決的編譯問題： 構造函數Assemble816（）未定義。不知道如何解決該問題 – 2013-02-21 21:31:39
對於actionPerformed中的響應式GUI調用：'SwingUtilities.invokeLater（new Runnable（）{...}）;'。 – 2013-02-21 21:34:39