goodbye java

// Problem Link : https://leetcode.com/problems/matrix-diagonal-sum/ class Solution { public int diagonalSum(int[][] mat) { int n = mat.length; int principal = 0, secondary = 0; for (int i = 0; i < n; i++) { principal += mat[i][i]; secondary += mat[i][n - i - 1]; } return n%2 == 0 ? (principal + secondary) : (principal...

ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_PHONE_STATE}, 225); Here is what the above code is Doing: 1. We are checking if the permission is already granted or not. 2. If the permission is not granted, we are requesting the permission. 3. If the permission is granted, we are calling the method to get the IMEI number.

sealed class Message { abstract val messageId: String } data class Track(val event: String, override val messageId: String): Message() Here is what the above code is Doing: 1. We’re creating a sealed class called Message. 2. We’re creating a data class called Track that extends Message. 3. We’re creating a function called processMessage that takes…

((Object) myVar).getClass().getName() //OR ((Object) myInt).getClass().getSimpleName() Here is what the above code is Doing: 1. The first line is a cast. It’s casting the variable myVar to an Object. 2. The second line is a method call. It’s calling the getClass() method on the Object myVar. 3. The third line is a method call. It’s calling…

Float and double Double is more precise than float and can store 64 bits, double of the number of bits float can store. … Float and double function in the same way in all programming languages. For example, in Java, both will throw NumberFormatException with operations where actual numbers are not involved Here is what…

startActivity(new Intent(“android.intent.action.VIEW”, Uri.parse(url))); Here is what the above code is Doing: 1. We are creating a new Intent object with the action VIEW. 2. We are passing the URL to the intent. 3. We are starting the activity with the intent.