linux操作系统学习-微指令程序执行模拟

代码（java实现）

package helloword;

interface IInstruction{
void exe(int input);
}
abstract class Instruction implements IInstruction{
static protected int register1;
static protected int register2;
static protected int ends;
static protected boolean state=true;
public static Memory[] mMemory = new Memory[10];
static void add(Memory me) {
mMemory[ends] = me;
ends++;
}
static void readMemory() {
for(int i=0;i<Instruction.ends;i++) {
mMemory[i].exe();
}
}
}
class Input extends  Instruction{
static public Input mInput= new Input();
static Input get() {
return mInput;
}
public void exe(int no) {
if(state) {
register1 = no;
state = false;
}else {
register2 = no;

4000
state = true;
}
}
}
class Add extends  Instruction{
static public Add mInput= new Add();
static Add get() {
return mInput;
}
public void exe(int no) {
register1 = register1+register2;
}
}
class Output extends  Instruction{
static public Output mInput= new Output();
static Output get() {
return mInput;
}
public void exe(int no) {
mMemory[no].value = register1;
}
}
class Finish extends Instruction{
static public Finish mInput= new Finish();
static Finish get() {
return mInput;
}
public void exe(int no) {
//ends = 0;
}
}
class IOut extends Instruction{
static public IOut mInput= new IOut();
static IOut get() {
return mInput;
}
public void exe(int no) {
ends = 0;
System.out.println(register1);
}
}
class CPU{
static void exe(){
Instruction.readMemory();
}
}

class Memory{
public Memory(IInstruction ins, int v) {
mInstruction = ins;
value = v;
}
public IInstruction mInstruction;
public int value;
void exe() {
mInstruction.exe(value);
}
}

public class Test {
public static void main(String[] args) {
System.out.println("hello worldff !");
Instruction.add(new Memory(Input.get(),5 ));
Instruction.add(new Memory(Input.get(),6 ));
Instruction.add(new Memory(Add.get(),0 ));
Instruction.add(new Memory(Finish.get(),0 ));
Instruction.add(new Memory(IOut.get(),0 ));

CPU.exe();
}
}