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我的方法之一是不工作，我用地圖和java反射。我不確定是因爲反思還是其他原因，但是在其他課程中我沒有使用反思。方法不反射
方法findAccessors()應從map2檢索值。該方法在類別ReadEdges中定義。該方法由類別FindMethod中定義的另一種方法findmethod()調用。
每當我通過方法findmethod()調用方法findAccessors()時，它將返回一個空的鏈接列表，而不是返回map2的值。這些類給出如下：ReadEdges
類：
import java.io.BufferedReader;
import java.io.CharArrayReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.regex.Pattern;
import javax.swing.JOptionPane;
public class ReadEdges {
static DFSclass dfs = new DFSclass();
List<String> sourcenodes=new ArrayList<String>(); // source node
List<String> destinationnodes=new ArrayList<String>(); // destination node
LinkedHashSet<String> findtransitions=new LinkedHashSet<String>();
LoanApprovalSystem LS = new LoanApprovalSystem();
TestdataGeneration testdata = new TestdataGeneration();
private static final String edgePat = "([a-zA-Z]|[0-9])+(,|\\x20)([a-zA-Z]|[0-9])+";
private static final String start=dfs.getstart();
private static final String edge = dfs.getedge();
private static final String transitions=dfs.gettransitions();
public static String a;
public static String b;
public static String c;
public static String d;
private Map<String, LinkedHashSet<String>> map = new HashMap();
private Map<String, LinkedHashSet<String>> map2 = new HashMap();
public int getLineCount(String edge){
int count = edge.split("[\n|\r]").length;
//System.out.println(count);
return count;
}
public void addEdge(String node1, String node2) throws IOException{
LinkedHashSet<String> adjacent = map.get(node1);
{
if(adjacent==null) {
adjacent = new LinkedHashSet();
map.put(node1, adjacent);
}
adjacent.add(node2);
}
}
public void addedgeandAccessor(String edge, String accessor) throws IOException{
LinkedHashSet<String> adjacent2 = map2.get(edge);
{
if(adjacent2==null) {
adjacent2 = new LinkedHashSet();
map2.put(edge, adjacent2);
//System.out.println(map2);
}
adjacent2.add(accessor);
//System.out.println(map2);
}
}
public void ReadEdge(String edgeinput,String transitionsinput,String accessorinput) throws InvalidInputException
{
char[] buf = edgeinput.toCharArray();
BufferedReader br = new BufferedReader(new CharArrayReader(buf));
char[] buf2 = transitionsinput.toCharArray();
BufferedReader br2 = new BufferedReader(new CharArrayReader(buf2));
String str2 = null;
char[] buf3 = accessorinput.toCharArray();
BufferedReader br3 = new BufferedReader(new CharArrayReader(buf3));
String str3 = null;
try
{
//a string for a next edge
String str = null;
//a StringTokinizer
StringTokenizer newNodes = null;
//get edges and set edges for the graph
while((((str = br.readLine()) != null) && (str2 = br2.readLine()) != null) && ((str3 = br3.readLine()) != null))
{
c=str;
d=str2;
LinkedHashSet<String> adjacent = map.get(str);
if(adjacent==null) {
adjacent = new LinkedHashSet();
map.put(str, adjacent);
}
adjacent.add(str2);
addedgeandAccessor(str,str3);
//if the edge inputs are not in good format, throw the exception
if(!Pattern.matches(edgePat, str.trim()))
JOptionPane.showMessageDialog(null,"An invalid input '" + str + "' for an edge. Please read the notes above the forms. ");
//use a comma to separate tokens
newNodes = new StringTokenizer (str, ", ");
//get the value of source node of an edge
String src = newNodes.nextToken();
//create the source node and destination node
String srcNode = src;
String desNode = newNodes.nextToken();
a=srcNode;
b=desNode;
addEdge(srcNode, desNode);
//System.out.println(adjacent);
//findTransition(a,b);
//findAccessors(a,b);
}
//System.out.println(listoftransitions);
}
catch (IOException e) {
JOptionPane.showMessageDialog(null, "Something is Wrong!");
e.printStackTrace();
}
}
public LinkedList<String> adjacentNodes(String last) {
LinkedHashSet<String> adjacent = map.get(last);
if(adjacent==null) {
return new LinkedList();
}
return new LinkedList<String>(adjacent);
}
public LinkedList<String> findTransition(String node1, String node2) throws IOException{
LinkedHashSet<String> adjacent = map.get(node1+" "+node2);
if(adjacent==null) {
return new LinkedList();
}
findtransitions = adjacent;
return new LinkedList<String>(findtransitions);
}
public LinkedList<String> findAccessors(String node1, String node2) {
LinkedHashSet<String> adjacent = map2.get(node1+" "+node2);
if(adjacent==null) {
return new LinkedList();
}
System.out.println(adjacent);
return new LinkedList<String>(adjacent);
}
public String getsrcNode(){
return a;
}
public String getedgeline(){
return c;
}
public String gettransitionline(){
return d;
}
}
類FindMethod：
import java.util.ArrayList;
import java.util.LinkedList;
import java.lang.reflect.*;
public class FindMethod {
ReadEdges r = new ReadEdges();
LoanApprovalSystem LS = new LoanApprovalSystem();
TestdataGeneration testdata = new TestdataGeneration();
int method1;
String method2;
boolean method3;
boolean method4;
String method5;
String m;
//returns the method name using refletion
public String getmethod(Method method){
FindMethod fm = new FindMethod();
m = method.getName();
String str = "";
str += m+"(" +fm.getparameter(method)+ ")";
// System.out.println(str);
return str;
}
//returns the parameter name of the method using refletion (i.e. (int))
public String getparameter(Method method){
String str = "";
Class<?>[] params = method.getParameterTypes();
for (int i = 0; i < params.length; i++) {
if (i > 0) {
str += ", ";
}
str += (params[i].getSimpleName());
}
return str;
}
public void findmethod(String s,String t,String transition) throws InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException{
FindMethod fm = new FindMethod();
LoanApprovalSystem cls = new LoanApprovalSystem();
Class<? extends LoanApprovalSystem> c = cls.getClass();
Object obj = c.newInstance();
Method[] methods = LoanApprovalSystem.class.getMethods();
for(Method method : methods)
{
//returns the method name (i.e. Receive or Asses)
m = method.getName();
fm.getmethod(method);
if(transition.equals(fm.getmethod(method)) && (transition.equals("Receive(int)")))
{
if(fm.getparameter(method).equals("int"))
{
//LS.Receive(testdata.TestData(s,t));
//invoking the method at runtime where m="Receive".
method = c.getMethod(m, int.class);
method.invoke(obj,testdata.TestData(s,t));
LinkedList<String> accessors= r.findAccessors(s,t);
System.out.println("A:"+accessors);
method1=LS.getamount();
System.out.println(m+"("+method1+")");
System.out.println("Amount: "+method1);
}
}
}
}
public static void main(String[] args) throws InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException
{
FindMethod fm = new FindMethod();
fm.findmethod("1","2","Receive(int)");
}
}
任何人能告訴我爲什麼我的方法findAccessors()沒有方法findmethod()內工作？或者請給我一個這個問題的解決方案。
注意：此程序中還有另一個類LoanApprovalSystem()。如果有人需要，我也可以給出這個類的定義。
你能更具體嗎？如何做到這一點或我應該在哪裏調用？你可以給我一個例子嗎？ – Hasan
我更新了我的答案和更多信息。您需要確保您正在調用填充map2的「ReadEdge」函數。 – Echo