condition on an unknown length array in java

java array length
for loop array java
for loop array length java
java for loop string array
traversing array in java
array of array in java
java array of objects
basic array programs in java

I have a char array of a length n, which I don't know the value. I need to write a condition to check if all elements of my array are one by one equal to a given char 'a'.

For example, with n = 4, I convert the array to a string by doing :

String str = new String(myArray); 

and then I do my condition like :

if (str.equals("aaaa")) {} 

but my problem is that the value of n is unknown. I tried to do :

for (int i = 0; i < n; i++) { 
    if (myArray[i].equals('a')) {
        ??
    }
}

But i don't know to do in '??' after the if, as I need to wait the for loop to be finished, because i want that all the elements of my array to be equal to 'a'.

In Java-8 you can do it using Stream#allMatch. It will reduce ceremonial code. You don't need to worry about the Array Length and setting the flag and breaking the loop.

    String[] strs = {"a","a","a"};
    boolean isAllEqual = Arrays.stream(strs).allMatch(e->e.equals("a"));
    System.out.println(isAllEqual);

Java Array Length: Get Size of Array, I have a char array of a length n, which I don't know the value. I need to write a condition to check if all elements of my array are one by one equal to a given char  Can you declare an array of unknown size in Javascript? Can this be done? Will it expand as it gets filled up with elements, or would you just have to create a very large array that would be more than enough size for any data you might want.

CodingBat Java Arrays and Loops, Length is used for looping and accessing the last element. Java program that uses array length public class Program { public static void main(String[] args) Now we see how using length in a for-loop boundary condition helps performance. I don't know the reasoning behind this attribute approach, but you would logically expect there to be a Java array length method, but for some reason this is a public field/attribute, and not a length method. Note that you can shorten this Java array length example by combining those last two lines, making the example look like this:

You can simply use regular expression. For example:

    String s = "aaaaaaaa";
    if(s.matches("[a]*"))
        System.out.println("s only contains a");
    else if(s.matches("[A]*"))
        System.out.println("s only contains A");
    else if(s.matches("[aA]*"))
        System.out.println("s only contains A and a");
    else
        System.out.println("s not match a*");

Taking An Array Of Integers As Input,(with Unknown Length), length of the array passed in, it will work for any size array that we pass in. Example Array Code. Here is code that iterates over a non-empty array to find the index  The length of the array is: 3 The length of the array is: 2 The length of the array is: 4 The length of the array is: 1 Display All Values of an Array We can use the length of an array to loop through all the elements of an array.

try this

private static  void n(){

    char[] n = {'a', 'b'};

    String[] myArray = {"a", "a", "a"};

    for(char c : n){
        int i = 0;
        int j = 0;
        for(String s : myArray){
            if((s.equals(String.valueOf(c)))){
                i++;
            }

            if(++j == n.length){

                System.out.println(i + "->" + n.length);

                if(n.length == i){
                    System.out.println("All the elemntes in your array are the same to char array");
                }else{
                    System.out.println("Not the same");
                }
            }
        }
    }
}

Java Arrays, taking an array of integers as input,(with unknown length): but I've had problems in setting the condition for "i" with both ways of: view source. How to initialize an Array in Java. An array can be one dimensional or it can be multidimensional also. When we invoke length of an array, it returns the number of rows in the array or the value of the leftmost dimension.

What about:

boolean matched = true;
for(int i = 0, n=myArray.length; i<n; i++){
    if(!myArray[i].equals("a")){
         matched = false;
    }
}

Then all you have to do is check matched boolean.

Char Array In Java | Introduction To Character Arrays In Java, Notice how the values to be inserted into the array are listed inside the { } block​. The length of this list  Answer: There are several ways to define an int array in Java; let’s take a look at a few examples. 1) Declare a Java int array with initial size; populate it later. If you know the desired size of your array, and you’ll be adding elements to your array some time later in your code, you can define a Java int array using this syntax:

Arrays in Java, Length Of Char Array; Sorting A Char Array; Converting A String Array Into Char Array. Let us start with a quick introduction to Char array,. Char  An array is a group of like-typed variables that are referred to by a common name.Arrays in Java work differently than they do in C/C++. Following are some important point about Java arrays. Since arrays are objects in Java, we can find their length using member length. This is different from C/C++ where we find length using sizeof.

Variable Arguments (Varargs) in Java, In this part of the Java tutorial, we will cover arrays. An array is a container object that holds a fixed number of values of a single type. The length  Getting the Number of Rows and Columns¶ Arrays know their length (how many elements they can store). It is a public read-only field so you can use dot-notation to access the field (arrayName.length). The length of the outer array is the number of rows and the length of one of the inner arrays is the number of columns.

Chapter 10. Arrays, length, the way we find the length of an array in Java. Note: A method can have variable length parameters with other parameters too, but one should ensure that​  Java String array is basically an array of objects. There are two ways to declare string array – declaration without size and declare with size. There are two ways to initialize string array – at the time of declaration, populating values after declaration.

Comments
  • You can use myArray.length to get the value of n (e.g. for (int i = 0; i < myArray.length; i++) })