ADD file via upload

src/Question.java

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+import java.util.Random;
+
+public class Question {
+    private int operatorNum;
+    private int isFenshu;
+    private String equation;
+    private String[] num=null;
+    private String[] ch=null;
+    public Question() {
+        this.operatorNum =1;
+        this.isFenshu = 0;
+        this.equation="";
+        num=new String[5];
+        ch=new String[4];
+    }
+
+    public void setOperatorNum() {
+        int a;
+        Random random=new Random();
+        a=random.nextInt(4);
+        if(a==0){
+            operatorNum=++a;
+        }else if(a==1){
+            operatorNum=++a;
+        }else if(a==2){
+            operatorNum=++a;
+        }else{
+            operatorNum=++a;
+        }
+    }
+    public void setIsFenshu(){
+        Random random=new Random();
+        isFenshu=random.nextInt(2);
+    }
+    public String setNum(){
+        Random random=new Random();
+        if(isFenshu==0){
+            return ""+(random.nextInt(25)+1);
+        }
+        int a;
+        int b;
+        a=random.nextInt(16);
+        b=random.nextInt(21);
+        if(a==0){
+            a++;
+        }
+        if(b==0){
+            b+=2;
+        }
+        if(b==1){
+            b++;
+        }
+        for (int i = 2; i <= (a<b?a:b); i++) {
+            if(a%i==0&&b%i==0){
+                a=a/i;
+                b=b/i;
+            }
+        }
+        if(b==1){
+            return ""+a;
+        }
+        return ""+a+"/"+b;
+    }
+    public void setEquation(){
+        setOperatorNum();
+        setIsFenshu();
+        num[0]=setNum();
+        for (int i = 0; i < operatorNum; i++) {
+            Random random=new Random();
+            int a=random.nextInt(4);
+            if(a==0){
+                ch[i]="+";
+            }else if(a==1){
+                ch[i]="-";
+            }else if(a==2){
+                ch[i]="✖";
+            }else{
+                ch[i]="➗";
+            }
+            setIsFenshu();
+            num[i+1]=setNum();
+        }
+    }
+
+    public String getEquation() {
+        this.equation="";
+        this.equation+=num[0];
+        for (int i = 0; i < operatorNum; i++) {
+            this.equation+=ch[i];
+            this.equation+=num[i+1];
+        }
+        this.equation+="=";
+        return equation;
+    }
+
+    public void result(){
+        int fenmu=1;
+        for (int i=0;i<operatorNum+1;i++) {
+            if(num[i].indexOf("/")!=-1){
+                num[i].substring(num[i].indexOf("/")+1);
+                fenmu*=Integer.parseInt(num[i].substring(num[i].indexOf("/")+1));
+            }
+        }
+        for (int i = 0; i < operatorNum+1; i++) {
+            if(num[i].indexOf("/")==-1){
+                num[i]=""+Integer.parseInt(num[i])*fenmu+"/"+fenmu;
+            }
+            if(num[i].indexOf("/")!=-1){
+                int sfenmu;
+                sfenmu=Integer.parseInt(num[i].substring(num[i].indexOf("/")+1));
+                num[i]=""+Integer.parseInt(num[i].substring(0, num[i].indexOf("/")))*(fenmu/sfenmu)+"/"+fenmu;
+            }
+        }
+        for (int i = 0; i < operatorNum; i++) {
+
+        }
+    }
+}