java栈-点击消除相邻重复的字母

publicstaticvoidmain(String[] args) {
Stack<Character>stack=newStack();
Scannersc=newScanner(System.in);
Stringstr=sc.nextLine();
for(inti=0;i<str.length();i++){
charch=str.charAt(i);
if(stack.isEmpty() ||ch!=stack.peek()){
stack.push(ch);
            }elseif(ch==stack.peek()){
stack.pop();
            }
        }
Stringstr2="";
//输出if(stack.isEmpty()){//如果是空栈，打印0System.out.println(0);
        }else{//如果不是空栈，循环出栈，反转字符串while(!stack.isEmpty()){
str2+=stack.pop(); //将出栈的元素赋值给 str2,但这个str2是出栈的顺序，是反着的            }
        }
Stringstr3="";    //使用str3来反转str2for(inti=str2.length()-1;i>=0;i--){
str3+=str2.charAt(i);
        }
System.out.println(str3);   //打印结果    }