出错一: public static void remove(ArrayList<String> list) { for (int i = 0; i < list.size(); i++) { String s = list.get(i); if (s.equals("bb")) { list.remove(s); } } } 1. 2. 3. 4. 5. 6. 7. 8. 遍历第二个元素字符串bb时因为符合删除条件,所以将该元素从数组中删...
In this section, we’ll see how to use theOrderingclass in Guava to check for a sorted list. First, we’ll see an example of a list containing elements of typeComparable: public static boolean isSorted(List<String> listOfStrings) { return Ordering.<String> natural().isOrdered(listOfStrin...
Check if a String Is a Number Using theDoubleClass in Java We can use theparseDouble()method of Double class that converts a string to double and returns a double type value. It throws an exception if it cannot be parsed. publicclassSimpleTesting{publicstaticvoidmain(String[]args){String ...
publicclassCheckStringInArray{publicstaticvoidmain(String[]args){String[]fruits={"apple","banana","orange","grape","watermelon"};Stringtarget="orange";booleanfound=false;for(Stringfruit:fruits){if(fruit.equals(target)){found=true;break;}}if(found){System.out.println(target+" is in the arra...
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remove(); } } // String conversion /** * 返回表示集合(元素)信息的字符串 */ public String toString() { Iterator<E> it = iterator(); if (! it.hasNext()) return "[]"; StringBuilder sb = new StringBuilder(); sb.append('['); for (;;) { E e = it.next(); sb.append(e ==...
In the following sections, we’ll look at the various ways of checking if a givenStringis a palindrome or not. 2.1. A Simple Approach We can simultaneously start iterating the givenstringforward and backward, one character at a time. If the there is a match the loop continues; otherwise,...
private static void check(Integer[] arr, int toCheckValue) { boolean test = Arrays.asList(arr).contains(toCheckValue); System.out.println("Is " + toCheckValue + " present in the array: " + test); } public static void main(String[] args) { ...
If you want to do the opposite, i.e., check if the list is not empty, you can use the following expression: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 importjava.util.List; classMain { publicstaticvoidmain(String[]args) ...
public static void main(String[] args) { List<Integer> list = Arrays.asList(1, 2, 3, 4, 5); int value = 3; boolean isExists = contains(list, value); System.out.println(isExists); // true } } Download Run Code That’s all about checking if a value exists in a List in Jav...