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String r = “3 + 6 =”;
String[] str = r.split("");
int a = Integer.parseInt(str[0]);
int b = Integer.parseInt(str[2]);
int c = 0;
if(str[1].equals("+")){
c = a+b;
}else if(str[1].equals("-")){
c = a-b;
}else if(str[1].equals("*")){
c = a*b;
}
str[3] = String.valueOf(c);
System.out.println(str[0]+str[1]+str[2]+str[3]);