indexof

问题 I have a question: I have a List Java that I have populated with different values. For example, I have: List<String[]> l = new ArrayList(); String[] lis = new String[3]; lis[0] = "A"; lis[1] = "B"; lis[2] = "C"; l.add(lis); and I have other values too. Now, I want to get the search in this list only the first field. For example, I want the A's indexOf. I have tried to write this code: int index = l.indexOf("A"); but I get -1 as return. I would like to know how I can access to a field of the

问题 I have a question: I have a List Java that I have populated with different values. For example, I have: List<String[]> l = new ArrayList(); String[] lis = new String[3]; lis[0] = "A"; lis[1] = "B"; lis[2] = "C"; l.add(lis); and I have other values too. Now, I want to get the search in this list only the first field. For example, I want the A's indexOf. I have tried to write this code: int index = l.indexOf("A"); but I get -1 as return. I would like to know how I can access to a field of the

问题 I have a question: I have a List Java that I have populated with different values. For example, I have: List<String[]> l = new ArrayList(); String[] lis = new String[3]; lis[0] = "A"; lis[1] = "B"; lis[2] = "C"; l.add(lis); and I have other values too. Now, I want to get the search in this list only the first field. For example, I want the A's indexOf. I have tried to write this code: int index = l.indexOf("A"); but I get -1 as return. I would like to know how I can access to a field of the

问题 What's the best method to get the index of an object in an object array given multiple of it's properties? Imagine the following example array: var array = [ { color: 'red', shape: 'square', weight: 200 }, { color: 'blue', shape: 'circle', weight: 300 }, { color: 'red', shape: 'circle', weight: 100 } ]; Now I would like to have the indexOf the object which color property is red and shape is circle which, in this example, would be 2 . Ideally the function would return the index of the object

问题 What's the best method to get the index of an object in an object array given multiple of it's properties? Imagine the following example array: var array = [ { color: 'red', shape: 'square', weight: 200 }, { color: 'blue', shape: 'circle', weight: 300 }, { color: 'red', shape: 'circle', weight: 100 } ]; Now I would like to have the indexOf the object which color property is red and shape is circle which, in this example, would be 2 . Ideally the function would return the index of the object

问题 What's the best method to get the index of an object in an object array given multiple of it's properties? Imagine the following example array: var array = [ { color: 'red', shape: 'square', weight: 200 }, { color: 'blue', shape: 'circle', weight: 300 }, { color: 'red', shape: 'circle', weight: 100 } ]; Now I would like to have the indexOf the object which color property is red and shape is circle which, in this example, would be 2 . Ideally the function would return the index of the object

问题 I have a table with multiple columns (for this question I only made two columns) and I want the user to be able to search through a column by the index depending on an option that the user can select. I have working code, but in order to change the search option, I had to copy the function for each input. How can I search by the index? If a user selects an option like (name), then the javascript function will change the index that it is searching to [0]. if the user selects (location), the

问题 I am trying to apply style to the text selected by the user(mouse drag) for which I need to get the start and end index of the selected text. I have tried using "indexOf(...)" method. but it returns the first occurrence of the selected substring. I want the actual position of the substring with respect to the original string. For example.., if I select the letter 'O' at position 3 [YOL O Cobe], I expect the index as 3 but the indexOf() method returns 1 which is the first occurrence of 'O' in

问题 I am trying to write a similar true/false statement, Similar to how the .selected() method would work in Angular typescript . The idea is to show an image if the calculation or *ngIf statement evaluates to True . The code is written in the app.html side Code: <img src="/project/x.png" *ngIf="selectedimage.indexOf(v) !== -1"><a href="{{i['link']}}" target="blank" (click)="update_viewed(z)"> There is a *ngFor statement right before this code, with ;let z = index at the end. The overall code

问题 Is there a built-in method to search a java.util.List specifying the first item to start the search from? Like you can do with Strings I know I can easily implement something on my own, but I'd rather not reinvent the wheel if Java or http://commons.apache.org/collections/api-release/org/apache/commons/collections/package-summary.html already has it. I'm not asking how to implement this, I'm asking whether something is already available A lot of the suggestions here were buggy. If anybody