JAVA 字符串角度的解题法 JAVA

import java.util.*;

public class a1073homework_of_brother {

public static void main(String args[]){

Scanner in =new Scanner(System.in);

int s =0;

while (in.hasNext()){ 

String a =in.nextLine();

int l=a.length();

int add=0,sub=0,equ=0;

double zz=0,yy=0,ee=0;

String xx,bb,eq;

boolean wen=true;

for(int i=0;i<l;i++){

char c =a.charAt(i);

if(c=='+'){

add=i;

}

if(c=='-'){

sub=i;

}

if(c=='='){

equ=i;

}

if(c=='?'){

wen=false;

}

}

if(wen){

if(add!=0){

xx=a.substring(0, add);

bb=a.substring(add+1, equ);

   zz=Double.parseDouble(xx);

   yy=Double.parseDouble(bb);

}else if(sub!=0){

xx=a.substring(0, sub);

bb=a.substring(sub+1, equ);

zz=Double.parseDouble(xx);

   yy=Double.parseDouble(bb);

}

eq=a.substring(equ+1);

ee=Double.parseDouble(eq);

if(add!=0&zz+yy==ee){

s++;

}else if(sub!=0&zz-yy==ee){

s++;

}

}else

continue;

}

System.out.print(s);

}

}