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My Bad Code

I wrote this code for codechef march 2021 contest for "college life 4" problem but was unsucessfull to solve it Link of the problem here This is for the futute me. Try to solve this problem if you think you are smart import java.util.*; import java.util.stream.*; import java.io.*; class multiMap { long key; long value; multiMap(long key,long value){ this.key = key; this.value = value; } void display(){ System.out.println("key : "+key+"\t value : "+value); } } class MyList{ List keyMapList = new ArrayList (); public MyList(long a , long b,long c,long A,long B,long C){ keyMapList.add(new multiMap(a,A)); keyMapList.add(new multiMap(b,B)); keyMapList.add(new multiMap(c,C)); keyMapList = keyMapList.stream().sorted(Comparator.comparing(e->e.key)).collect(Collectors.toList()); } void pop(){ keyMapList.remove(0); } long getValue(long index){ return keyMapList.get((int)index).value; } long getKey(){ return keyMapList.get...
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java:17: error: local variables referenced from a lambda expression must be final or effectively final count ++ ;

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 Modifying variables inside java lambdas. Integer list[] = {1,2,3,4,5,6,7,8}; int index = 0; Arrays.asList(list).forEach(e -> { System.out.println(e+" at index "+index); index++; }); Error : maze2.java:22: error: local variables referenced from a lambda expression must be final or effectively final System.out.println(e+" at index "+index); ^ maze2.java:23: error: local variables referenced from a lambda expression must be final or effectively final index++; ^ Solution : Integer list[] = {1,2,3,4,5,6,7,8}; int[] index = {0}; Arrays.asList(list).forEach(e -> { System.out.println(e+" at index "+index[0]); index[0]++; }); Output : 1 at index 0 2 at index 1 3 at index 2 4 at index 3 5 at index 4 6 at index 5 7 at index 6 8 at index 7
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Family Tree Project in Java

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Creating Family tree in java .  Trees are such an important structure in computer science. But what more important tree, than our family tree? ❤️   👨‍👩‍👧‍👦   ❤️    Made this simple program in java to implement family tree. Java File import java.util.*; class Person { String name; boolean married; String wife; int noOfChild; Person[] childs; public Person(String name){ this.name = name; } public Person(String name,boolean married,String wife,Person[] childs,int noOfChild) { this.name = name; this.married = married; this.wife = wife; this.childs = childs; this.noOfChild = noOfChild; } public Person(String name , boolean married,String wife) { this.name = name; this.married = married; this.wife = wife; } } class familyTree { static int population; static Scanner input = new Scanner...
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Creating basic tic tac toe android app using java

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 Marvel Tic Tac Toe Android Game ( Java ) In this blog I we will create basic android app. We will be coding in java.   package com.example.batvsiron ; import androidx.appcompat.app.AppCompatActivity ; import android.os.Bundle ; import android.util.Log ; import android.view.View ; import android.widget.Button ; import android.widget.GridLayout ; import android.widget.ImageView ; import android.widget.TextView ; import android.widget.Toast ; import java.util.Arrays ; public class MainActivity extends AppCompatActivity { int active = 0 ; public int [][] winningPosition = { { 0 , 1 , 2 } , { 3 , 4 , 5 } , { 6 , 7 , 8 } , { 0 , 3 , 6 } , { 1 , 4 , 7 } , { 2 , 5 , 8 } , { 0 , 4 , 8 } , { 2 , 4 , 6 } } ; public int [] moves = { 111 , 111 , 111 , 111 , 111 , 111 , 111 , 111 , 111 } ; public int checkWinning () { for ( int [] arr : winningPosition ) { ...
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