Arrays and Collection

[noobplus]

import java.util.Collections;

  int min = (int) Collections.min(Arrays.asList(numbers));

Hi,
The codings work , and I tried a class with same concept but it shows errors ,

import java.util.Arrays;
import java.util.Collections;
public class ArrayMinMax 
{
    public static void main(Integer[] args)
    {
        int min = (int) Collections.min(Arrays.asList(args));//the error is "Bound mismatch: The generic method min(Collection<? extends T>) 
//of type Collections is not applicable for the arguments (List<int[]>). The inferred type int[] is not a valid substitute for the
// bounded parameter <T extends Object & Comparable<? super T>>"
        int max = (int) Collections.max(Arrays.asList(args));
        System.out.println("Min number: " + min);
        System.out.println("Max number: " + max);
    }
}

Could u tell what should be done there..

thx
dhilip

[wsaryada]

It seems like the args passed to the Arrays.asList() method was treated like it was a primitive integers. What version of Java are you using?

Btw, the main method of your java class should have the String[] as the parameter to make it executable.

[DarrylBurke]

Split from http://www.java-forums.org/new-java/...ring-args.html

noobplus, don't hijack another poster's thread. If you do this again, your posts and any responses to them will be deleted.

db

[noobplus]

Split from http://www.java-forums.org/new-java/...ring-args.html

noobplus, don't hijack another poster's thread. If you do this again, your posts and any responses to them will be deleted.

db

I didn't hijack actually. I posted this in the old forum. Someone else moved it to a new post
even I don't find an 'edit post' button in that post
regards
dhilip

[noobplus]

It seems like the args passed to the Arrays.asList() method was treated like it was a primitive integers. What version of Java are you using?

Btw, the main method of your java class should have the String[] as the parameter to make it executable.

Hi,
my java is java6, I did it in eclipse
and I made "String[]" to "Integer[]" for the original starter of the thread 'mortus' because he wanted to find the maximum values of the arguments
and line 5 containing "Integer[]" didn't show an error in eclipse with java 6
thx,
dhilip

[JosAH]

w.r.t. the question: how can the minimum of a bunch of Strings ever be an int? Know what you're doing before you blindly try to copy a piece of code that you don't understand.

Jos

[noobplus]

w.r.t. the question: how can the minimum of a bunch of Strings ever be an int? Know what you're doing before you blindly try to copy a piece of code that you don't understand.

Jos

this was in an old thread
he was asking to find maximum of the arguments given to a class
and someone moved this post to a new thread by the time you were hearing to "clubbed to death" (not concerned if it is not from england and it is from hollywood anyways)

bunch of Strings

bunch of Integer[] not Strings

dhilip
[code]

[noobplus]

w.r.t. the question: how can the minimum of a bunch of Strings ever be an int? Know what you're doing before you blindly try to copy a piece of code that you don't understand.

Jos

import java.util.Arrays;
import java.util.Collections;
public class ArrayMinMax
{
    public static void main(String[] args)
    {
             int intarray[] = new int[args.length];	     
	    	 for(int i=0;i<intarray.length;i++)
	    	 intarray[i] = Integer.parseInt(args[i]);
	     int min = (int) Collections.min(Arrays.asList(intarray));//this one shows errors anyways too
        int max = (int) Collections.max(Arrays.asList(intarray));
        System.out.println("Min number: " + min);
        System.out.println("Max number: " + max);
    }
}

[JosAH]

this was in an old thread
he was asking to find maximum of the arguments given to a class
and someone moved this post to a new thread by the time you were hearing to "clubbed to death" (not concerned if it is not from england and it is from hollywood anyways)

bunch of Integer[] not Strings

Not in your example; they're a bunch of Strings and the Collections.min( ... ) method tries to return a String; you can't weazle yourself out of it: your example was simply as wrong as can be; no excuses.

Jos

[noobplus]

problem solved, this is the answer for Mortus

import java.util.Arrays;
import java.util.Collections;
public class ArrayMinMax
{
    public static void main(String[] args)
    {
             Integer intarray[] = new Integer[args.length];	     //I dont know difference between int[] and Integer[]
// yet sorry for that
	    	 for(int i=0;i<intarray.length;i++)
	    	 intarray[i] = Integer.parseInt(args[i]);
	     int min = (int) Collections.min(Arrays.asList(intarray));
        int max = (int) Collections.max(Arrays.asList(intarray));
        System.out.println("Min number: " + min);
        System.out.println("Max number: " + max);
    }
}

[JosAH]

import java.util.Arrays;
import java.util.Collections;
public class ArrayMinMax
{
    public static void main(String[] args)
    {
             int intarray[] = new int[args.length];	     
	    	 for(int i=0;i<intarray.length;i++)
	    	 intarray[i] = Integer.parseInt(args[i]);
	     int min = (int) Collections.min(Arrays.asList(intarray));//this one shows errors anyways too
        int max = (int) Collections.max(Arrays.asList(intarray));
        System.out.println("Min number: " + min);
        System.out.println("Max number: " + max);
    }
}

See the API documentation for the Arrays.asList(T ... a) method; it doesn't understand an int[] as a bunch of ints; the work around is to use an Integer[] intarray instead; b.t.w. Eclipse would've told you so.

Jos

[wsaryada]

You should use Integer[] instead of int[] because the Arrays.asList() method required a parameter that implements the java.lang.Comparable.

[noobplus]

See the API documentation for the Arrays.asList(T ... a) method; it doesn't understand an int[] as a bunch of ints; the work around is to use an Integer[] intarray instead; b.t.w. Eclipse would've told you so.

Jos

eclipse didn't ask me to convert it to Integer[] , i updated eclipse yesterday
-edited: I mean it gave option only for "String[]"

dhilip

[JosAH]

You should use Integer[] instead of int[] because the Arrays.asList() method required a parameter that implements the java.lang.Comparable.

Where does the API documentation says so? The Array.asList( ... ) method just needs an array of objects (not primitives).
kind regards,

Jos

[JosAH]

eclipse didn't ask me to convert it to Integer[] , i updated eclipse yesterday
-edited: I mean it gave option only for "String[]"

Because the argument you supplied was a String[] in your original example (in this thread) don't obfuscate matters please with your incorrect remarks and apply Occam's razor ...

Jos

[wsaryada]

Sorry, you were right Jos :) The method that require a parameter to implement the java.lang.Comparable is the Collections.min(...) / Collections.max(...) and not the Arrays.asList(...) method.

[JosAH]

Sorry, you were right Jos :) The method that require a parameter to implement the java.lang.Comparable is the Collections.min(...) / Collections.max(...) and not the Arrays.asList(...) method.

No need to say sorry; I just want to keep this thread as tidy as possible because the OP of this thread sprays around that much (irrelevant) nonsense that this thread can't be properly answered and closed anymore.

kind regards,

Jos

[noobplus]

No need to say sorry; I just want to keep this thread as tidy as possible because the OP of this thread sprays around that much (irrelevant) nonsense that this thread can't be properly answered and closed anymore.

kind regards,

Jos

I didn't start the thread

[JosAH]

I didn't start the thread

That is sophism: you hijacked another thread and a moderator split it and created a new thread (as you should've done).

Jos

[noobplus]

That is sophism: you hijacked another thread and a moderator split it and created a new thread (as you should've done).

Jos

I was trying to help him. this code is cent percent on his topic. his name is Mortus. this code is trying to fine minimum of argument integer values. What is hijacking actually?