CODEWITHSUNDEEP
java
user1030431
user1030431

Reputation: 23

Compare 2d array to 1d in Java

Guys I'm a bit new in using java and i'm trying to write a program that will check the 2d array if it contains the value of 1d array.The second array is like a list of numbers and it will check the first array if they match.

array1[6]= {"a","b","c","d","e","f"}
array2[1][4]={{"a","b","c","d"}{"d","e","f","g"}}
array2[0]= rowcomplete ; // because it contain all the value a,b,c,d
array2[1]= incomplete; // because it only match d,e,f but not g

This is my code:

String array1[] = {"a","b","c","d","e","f"};
String array2[][] = {{"a","b","c","d"}, {"d","e","f","g"}};

for (int 2row = 0; 2row < array2.length; 2row++) {
  for (int 2column = 0;2column< array2[2row].length;2column++) {    
    for(int 1row=0; 1row < array1[1row].length();1row++) {
      if (array2[2row][2column].equals(array1[1row])) {
        System.out.println("complete"); 
      }
      else{

      }
    }
  }
}

Upvotes: 2

Views: 1841

Answers (4)

Tesseract
Tesseract

Reputation: 8139

You can also use Arrays.equals

String array1[] = {"a","b","c","d","e","f"};
String array2[][] = {{"a","b","c","d"}, {"d","e","f","g"}};

for (int i = 0; i < array2.length; i++) {
    if(java.util.Arrays.equals(array1, array2[i]) {
        ...
    }
}

Upvotes: 0

c.dunlap
c.dunlap

Reputation: 600

This would be easier if you use an array list for array1 because you can use the arrayList.contains() to determine if the value is in the list.

Using an array list and declaring/initializing array2 as you did before, try this: ArrayList array1 = new ArrayList(); Collections.addAll(array1, "a", "b", "c", "d", "e", "f");
boolean matchFlag;

for(int i = 0;i< array2.length; i++){
    matchFlag = true;
    for(int j=0;j<array2[i].length; j++){
        if(array1.contains(array2[i][j]) == false){
            //found string that did not match
            //
            matchFlag = false;
        }
    }
    if(matchFlag){
       //complete array
    }
}

Hope this helps!

Upvotes: 2

Mechkov
Mechkov

Reputation: 4324

Just to clarify what Banthar's comment above implies:

Java variable names can NOT start with a digit. They can only start with an _underscore, letter or a dollar sign $. After the first letter, you can use digits.

Upvotes: 2

Francisco Paulo
Francisco Paulo

Reputation: 6322

An easy way to do that would be to use the Arrays class to transform your arrays into a List and the use the containsAll method, like this:

  String array1 []={"a","b","c","d","e","f"};
  String array2 [][] ={{"a","b","c","d"},{"d","e","f","g"}};

  List<String> array1AsList = Arrays.asList(array1);

  for (int i = 0; i < array2.length; i++) {
      List<String> array2rowAsList = Arrays.asList(array2[i]);

      if(array1AsList.containsAll(array2rowAsList)){
          System.out.println("row " + i + " is complete");
      }
  }

Upvotes: 3

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