public static boolean isValidParentheses(String s) { Stack<Character> stack = new Stack<>(); for (char c : s.toCharArray()) { if (c == '(' || c == '[' || c == '{') { stack.push(c); } else if (c == ')' || c == ']' || c == '}') { if (stack.isEmpty...
public int calculate(String s) { Stack<Integer> stack = new Stack<>(); int sign = 1; int res = 0; for (int i = 0; i < s.length(); i++) { if (Character.isDigit(s.charAt(i))) { int num = s.charAt(i) - '0'; // 如果下一个还是数字,就继续计算 while (i + 1 < ...
public boolean isValid(String s) {// 定义一个栈Stack<Character> stack = new Stack<>();int len = s.length();for (int i = 0; i < len; i++) {char c = s.charAt(i);if (c == '(' || c == '[' || c == '{'){// 入栈stack.push(c);} else { // 有括号// 判断...
用栈Stack 创建对象(类型不同) Stack<Integer> stack =newStack<>(); Stack<Character> stack =newStack<>(); 示例 //1.创建一个字符型的栈Stack<Character> stack=newStack<>(); System.out.println(stack);//2.测试栈是否为空System.out.println(stack.empty());//3.入栈stack.push('a'); stack...
publicbooleanisValid(String s){char[]symbol=s.toCharArray();Stack<Character>stack=newStack<Character>();Map<Character,Character>map=newHashMap<Character,Character>(){{put('(',')');put('[',']');put('{','}');}};for(charc:symbol){if(c=='('||c=='['||c=='{')stack.push(c...
importjava.util.Stack;publicclassBracketMatching{publicstaticbooleanisValid(Strings){Stack<Character>stack=newStack<>();for(charc:s.toCharArray()){if(c=='('||c=='{'||c=='['){stack.push(c);}else{if(stack.empty())returnfalse;chartop=stack.pop();if((c==')'&&top!='(')||(c==...
// 定义一个栈Stack<Character>stack=newStack<>(); 接着遍历字符串,将遇到的左字符放入栈中,如果遇到右字符串,首先判断栈是否为空,栈为空返回false,接着取出栈顶元素,判断栈顶元素与遍历到的右字符是否为一对,否则返回false 代码语言:javascript 复制 ...
堆内存是被多个线程共享的，而栈内存是线程私有的。堆主要用来存储运行时所有的对象数据和各种数组，简单...
publicclassPostfixCalculator{// 计算后缀表达式publicstaticdoublecalculate(StringpostfixExpression){MyStackstack=newMyStack(postfixExpression.length());for(charch:postfixExpression.toCharArray()){if(Character.isDigit(ch)){stack.push(ch);}else{doubleoperand2=stack.pop()-'0';doubleoperand1=stack.pop()-...
character-limit bobble 9,965 modifiedJan 23 at 4:17 27votes 1answer 615views Answer that was deleted by a moderator was undeleted by normal users; why was it allowed and can it be fixed? bug status-completed moderators deleted-posts