blocks|key|673132|text|循环也是非常有用的学习，特别是在使用数组时，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673133|int[]+array+=+new+int[10];
Random+rand+=+new+Random();
for+(int+i+=+0;+i+<+array.length;+i%2B%2B)
++++array[i]+=+rand.nextInt(100)+%2B+1;
Arrays.sort(array);
System.out.println(Arrays.toString(array));
//+in+reverse+order
for+(int+i+=+array.length+-+1;+i+>=+0;+i--)
++++System.out.print(array[i]+%2B+"+");
System.out.println();|code-block|syntax|javascript|673134|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Loops are also very useful to learn about, esp When using arrays,

<pre><code>int[] array = new int[10];
Random rand = new Random();
for (int i = 0; i &lt; array.length; i++)
 array[i] = rand.nextInt(100) + 1;
Arrays.sort(array);
System.out.println(Arrays.toString(array));
// in reverse order
for (int i = array.length - 1; i &gt;= 0; i--)
 System.out.print(array[i] + " ");
System.out.println();
</code></pre>

blocks|key|458718|text|在println之前添加行，您的数组就会排序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|458719|Arrays.sort(+array+);|code-block|syntax|javascript|458720|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Add the Line before println and your array gets sorted

<pre><code>Arrays.sort( array );
</code></pre>

blocks|key|458675|text|看一看Arrays.sort()|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|458676|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/6/docs/api/java/util/Arrays.html#sort%2528int%255B%255D%2529^0|3|D|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Take a look at <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Arrays.html#sort%28int%5B%5D%29" rel="noreferrer">Arrays.sort()</a>

blocks|key|458846|text|我很懒，添加了循环|type|unstyled|depth|inlineStyleRanges|entityRanges|data|458847|import+java.util.Arrays;


public+class+Sort+{
++++public+static+void+main(String+args[])
++++{
++++++++int+[]+array+=+new+int[10];
++++++++for+(+int+i+=+0+;+i+<+array.length+;+i%2B%2B+)+{
++++++++++++array[i]+=+((int)(Math.random()*100%2B1));
++++++++}
++++++++Arrays.sort(+array+);
++++++++for+(+int+i+=+0+;+i+<+array.length+;+i%2B%2B+)+{
++++++++++++System.out.println(array[i]);
++++++++}
++++}
}|code-block|syntax|javascript|458848|您的数组长度为10。您需要一个变量(i)，该变量将值从0转换为9。|offset|length|style|CODE|458849|for+(+int+i+=+0++;+i+<+array.length+;+++i%2B%2B+)+
+++++++%5E+++++++++++++++%5E+++++++++++++++++++%5E
+++++++%7C+++++++++++++++%7C+++++++++++++++++++------++increment+(+i+=+i+%2B+1+)
+++++++%7C+++++++++++++++%7C
+++++++%7C+++++++++++++++%2B--------------------------+repeat+as+long+i+<+10
+++++++%2B------------------------------------------+start+value+of+i


Arrays.sort(+array+);|458850|是一个对数组进行排序的库方法。|458851|entityMap^0|0|0|I|1|R|1|V|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]|$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

I was lazy and added the loops

<pre><code>import java.util.Arrays;


public class Sort {
 public static void main(String args[])
 {
 int [] array = new int[10];
 for ( int i = 0 ; i &lt; array.length ; i++ ) {
 array[i] = ((int)(Math.random()*100+1));
 }
 Arrays.sort( array );
 for ( int i = 0 ; i &lt; array.length ; i++ ) {
 System.out.println(array[i]);
 }
 }
}
</code></pre>

Your array has a length of 10. You need one variable (<code>i</code>) which takes the values from <code>0</code>to <code>9</code>.

<pre><code>for ( int i = 0 ; i &lt; array.length ; i++ ) 
 ^ ^ ^
 | | ------ increment ( i = i + 1 )
 | |
 | +-------------------------- repeat as long i &lt; 10
 +------------------------------------------ start value of i


Arrays.sort( array );
</code></pre>

Is a library methods that sorts arrays.

blocks|key|459002|text|Arrays.sort(yourArray)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|459003|将完美地完成这项工作|unstyled|459004|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>Arrays.sort(yourArray)
</code></pre>

will do the job perfectly

blocks|key|459123|text|对于自然顺序：Arrays.sort(array)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|459124|对于反向顺序：Arrays.sort(array,+Collections.reverseOrder());+--+>它是集合类中的一个静态方法，它将进一步调用自身的内部类以返回反向比较器。|459125|entityMap^0|7|I|0|7|1B|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

For natural order : <code>Arrays.sort(array)</code>

For reverse Order : <code>Arrays.sort(array, Collections.reverseOrder());</code> -- > It is a static method in Collections class which will further call an inner class of itself to return a reverse Comparator.

blocks|key|673307|text|int[]+array+=+{2,+3,+4,+5,+3,+4,+2,+34,+2,+56,+98,+32,+54};

for+(int+i+=+0;+i+<+array.length;+i%2B%2B)+{
++++for+(int+j+=+0;+j+<+array.length;+j%2B%2B)+{
++++++++if+(array[i]+<+array[j])+{
++++++++++++int+temp+=+array[i];
++++++++++++array[i]+=+array[j];
++++++++++++array[j]+=+temp;
++++++++}
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|673308|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>int[] array = {2, 3, 4, 5, 3, 4, 2, 34, 2, 56, 98, 32, 54};

for (int i = 0; i &lt; array.length; i++) {
 for (int j = 0; j &lt; array.length; j++) {
 if (array[i] &lt; array[j]) {
 int temp = array[i];
 array[i] = array[j];
 array[j] = temp;
 }
 }
}
</code></pre>

blocks|key|672914|text|您可以使用Arrays.sort(+array+)对整型数组进行排序。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|672915|entityMap^0|5|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You can sort a int array with <code>Arrays.sort( array )</code>.

blocks|key|673213|text|下面是如何在你的程序中使用它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673214|public+static+void+main(String+args[])
{
++++int+[]+array+=+new+int[10];

++++array[0]+=+((int)(Math.random()*100%2B1));
++++array[1]+=+((int)(Math.random()*100%2B1));
++++array[2]+=+((int)(Math.random()*100%2B1));
++++array[3]+=+((int)(Math.random()*100%2B1));
++++array[4]+=+((int)(Math.random()*100%2B1));
++++array[5]+=+((int)(Math.random()*100%2B1));
++++array[6]+=+((int)(Math.random()*100%2B1));
++++array[7]+=+((int)(Math.random()*100%2B1));
++++array[8]+=+((int)(Math.random()*100%2B1));
++++array[9]+=+((int)(Math.random()*100%2B1));

++++Arrays.sort(array);+

++++System.out.println(array[0]+%2B"+"+%2B+array[1]+%2B"+"+%2B+array[2]+%2B"+"+%2B+array[3]
++++%2B"+"+%2B+array[4]+%2B"+"+%2B+array[5]%2B"+"+%2B+array[6]%2B"+"+%2B+array[7]%2B"+"+
++++%2B+array[8]%2B"+"+%2B+array[9]+);++++++++

}|code-block|syntax|javascript|673215|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is how to use this in your program:

<pre><code>public static void main(String args[])
{
 int [] array = new int[10];

 array[0] = ((int)(Math.random()*100+1));
 array[1] = ((int)(Math.random()*100+1));
 array[2] = ((int)(Math.random()*100+1));
 array[3] = ((int)(Math.random()*100+1));
 array[4] = ((int)(Math.random()*100+1));
 array[5] = ((int)(Math.random()*100+1));
 array[6] = ((int)(Math.random()*100+1));
 array[7] = ((int)(Math.random()*100+1));
 array[8] = ((int)(Math.random()*100+1));
 array[9] = ((int)(Math.random()*100+1));

 Arrays.sort(array); 

 System.out.println(array[0] +" " + array[1] +" " + array[2] +" " + array[3]
 +" " + array[4] +" " + array[5]+" " + array[6]+" " + array[7]+" " 
 + array[8]+" " + array[9] ); 

}
</code></pre>

blocks|key|673270|text|仅供参考，您现在可以使用Java8new+API对使用parallelSort的任何类型的数组进行排序|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|673271|parallelSort使用Java7中引入的Fork/Join框架将排序任务分配给线程池中可用的多个线程。|673272|可用于对int数组进行排序的两种方法，|673273|parallelSort(int[]+a)
parallelSort(int[]+a,int+fromIndex,int+toIndex)|code-block|syntax|javascript|673274|entityMap^0|R|C|0|0|C|0|4|3|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|Z|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

just FYI, you can now use Java 8 new API for sorting any type of array using <code>parallelSort</code>

<code>parallelSort</code> uses Fork/Join framework introduced in Java 7 to assign the sorting tasks to multiple threads available in the thread pool.

the two methods that can be used to sort <code>int</code> array,

<pre><code>parallelSort(int[] a)
parallelSort(int[] a,int fromIndex,int toIndex)
</code></pre>

blocks|key|459142|text|您可以使用Arrays.sort()函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|459143|sort()+method+is+a+java.util.Arrays+class+method.++++++++++
Declaration+:+Arrays.sort(arrName)|code-block|syntax|javascript|459144|entityMap|0|LINK|mutability|MUTABLE|url|http://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/^0|5|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You may use <a href="http://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/" rel="nofollow noreferrer">Arrays.sort()</a> function. 

<pre><code>sort() method is a java.util.Arrays class method. 
Declaration : Arrays.sort(arrName)
</code></pre>

blocks|key|673425|text|在打印数组之前，只需执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673426|Arrays.sort(array);|offset|length|style|CODE|673427|注意：-您必须通过以下语句导入数组类：-|673428|import+java.util.Arrays;|673429|entityMap^0|0|0|J|0|0|0|O|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

Simply do the following before printing the array:-
<code>Arrays.sort(array);</code>
Note:-
you will have to import the arrays class by saying:-
<code>import java.util.Arrays;</code>

blocks|key|673292|text|最有效的方法！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673293|public+static+void+main(String+args[])
{
++++int+[]+array+=+new+int[10];//creates+an+array+named+array+to+hold+10+int's
++++for(int+x:+array)//for-each+loop!
++++++x+=+((int)(Math.random()*100%2B1));
++++Array.sort(array);
++++for(int+x:+array)
++++++System.out.println(x%2B"+");
}|code-block|syntax|javascript|673294|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

MOST EFFECTIVE WAY!

<pre><code>public static void main(String args[])
{
 int [] array = new int[10];//creates an array named array to hold 10 int's
 for(int x: array)//for-each loop!
 x = ((int)(Math.random()*100+1));
 Array.sort(array);
 for(int x: array)
 System.out.println(x+" ");
}
</code></pre>

blocks|key|459167|text|我们还可以使用二叉树通过按顺序遍历的方法来获得排序数组。下面的代码还实现了基本的二进制搜索树。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|459168|class+Util+{
++++public+static+void+printInorder(Node+node)+
++++{+
++++++++if+(node+==+null)+{
++++++++++++return;
++++++++}+

++++++++/*+traverse+left+child+*/
++++++++printInorder(node.left);+

++++++++System.out.print(node.data+%2B+"+");+

++++++++/*+traverse+right+child+*/
++++++++printInorder(node.right);+
+++++}+

++++public+static+void+sort(ArrayList<Integer>+al,+Node+node)+{
++++++++if+(node+==+null)+{
++++++++++++return;
++++++++}+

++++++++/*+sort+left+child+*/
++++++++sort(al,+node.left);+

++++++++al.add(node.data);

++++++++/*+sort+right+child+*/
++++++++sort(al,+node.right);+

++++}
}

class+Node+{
++++Node+left;
++++Integer+data;
++++Node+right;

++++public+Node(Integer+data)+{
++++++++this.data+=+data;
++++}

++++public+void+insert(Integer+element)+{
++++++++if(element.equals(data))+{
++++++++++++return;
++++++++}

++++++++//+if+element+is+less+than+current+then+we+know+we+will+insert+element+to+left-sub-tree
++++++++if(element+<+data)+{
++++++++++++//+if+this+node+does+not+have+a+sub+tree+then+this+is+the+place+we+insert+the+element.
++++++++++++if(this.left+==+null)+{
++++++++++++++++this.left+=+new+Node(element);++
++++++++++++}+else+{+//+if+it+has+left+subtree+then+we+should+iterate+again.
++++++++++++++++this.left.insert(element);
++++++++++++}
++++++++}+else+{
++++++++++++if(this.right+==+null)+{
++++++++++++++++this.right+=+new+Node(element);
++++++++++++}+else+{
++++++++++++++++this.right.insert(element);
++++++++++++}
++++++++}
++++}
}

class+Tree+{
++++Node+root;

++++public+void+insert(Integer+element)+{
++++++++if(root+==+null)+{
++++++++++++root+=+new+Node(element);
++++++++}+else+{
++++++++++++root.insert(element);
++++++++}+++++++
++++}

++++public+void+print()+{
++++++++Util.printInorder(root);
++++}

++++public+ArrayList<Integer>+sort()+{
++++++++ArrayList<Integer>+al+=+new+ArrayList<Integer>();
++++++++Util.sort(al,+root);
++++++++return+al;
++++}
}

public+class+Test+{

++++public+static+void+main(String[]+args)+{

++++++++int+[]+array+=+new+int[10];

++++++++array[0]+=+((int)(Math.random()*100%2B1));
++++++++array[1]+=+((int)(Math.random()*100%2B1));
++++++++array[2]+=+((int)(Math.random()*100%2B1));
++++++++array[3]+=+((int)(Math.random()*100%2B1));
++++++++array[4]+=+((int)(Math.random()*100%2B1));
++++++++array[5]+=+((int)(Math.random()*100%2B1));
++++++++array[6]+=+((int)(Math.random()*100%2B1));
++++++++array[7]+=+((int)(Math.random()*100%2B1));
++++++++array[8]+=+((int)(Math.random()*100%2B1));
++++++++array[9]+=+((int)(Math.random()*100%2B1));

++++++++Tree+tree+=+new+Tree();

++++++++for+(int+i+=+0;+i+<+array.length;+i%2B%2B)+{
++++++++++++tree.insert(array[i]);
++++++++}

++++++++tree.print();

++++++++ArrayList<Integer>+al+=+tree.sort();++++

++++++++System.out.println("sorted+array+:+");
++++++++al.forEach(item+->+System.out.print(item+%2B+"+"));
}|code-block|syntax|javascript|459169|}|459170|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

We can also use binary search tree for getting sorted array by using in-order traversal method. The code also has implementation of basic binary search tree below.

<pre><code>class Util {
 public static void printInorder(Node node) 
 { 
 if (node == null) {
 return;
 } 

 /* traverse left child */
 printInorder(node.left); 

 System.out.print(node.data + " "); 

 /* traverse right child */
 printInorder(node.right); 
 } 

 public static void sort(ArrayList&lt;Integer&gt; al, Node node) {
 if (node == null) {
 return;
 } 

 /* sort left child */
 sort(al, node.left); 

 al.add(node.data);

 /* sort right child */
 sort(al, node.right); 

 }
}

class Node {
 Node left;
 Integer data;
 Node right;

 public Node(Integer data) {
 this.data = data;
 }

 public void insert(Integer element) {
 if(element.equals(data)) {
 return;
 }

 // if element is less than current then we know we will insert element to left-sub-tree
 if(element &lt; data) {
 // if this node does not have a sub tree then this is the place we insert the element.
 if(this.left == null) {
 this.left = new Node(element); 
 } else { // if it has left subtree then we should iterate again.
 this.left.insert(element);
 }
 } else {
 if(this.right == null) {
 this.right = new Node(element);
 } else {
 this.right.insert(element);
 }
 }
 }
}

class Tree {
 Node root;

 public void insert(Integer element) {
 if(root == null) {
 root = new Node(element);
 } else {
 root.insert(element);
 } 
 }

 public void print() {
 Util.printInorder(root);
 }

 public ArrayList&lt;Integer&gt; sort() {
 ArrayList&lt;Integer&gt; al = new ArrayList&lt;Integer&gt;();
 Util.sort(al, root);
 return al;
 }
}

public class Test {

 public static void main(String[] args) {

 int [] array = new int[10];

 array[0] = ((int)(Math.random()*100+1));
 array[1] = ((int)(Math.random()*100+1));
 array[2] = ((int)(Math.random()*100+1));
 array[3] = ((int)(Math.random()*100+1));
 array[4] = ((int)(Math.random()*100+1));
 array[5] = ((int)(Math.random()*100+1));
 array[6] = ((int)(Math.random()*100+1));
 array[7] = ((int)(Math.random()*100+1));
 array[8] = ((int)(Math.random()*100+1));
 array[9] = ((int)(Math.random()*100+1));

 Tree tree = new Tree();

 for (int i = 0; i &lt; array.length; i++) {
 tree.insert(array[i]);
 }

 tree.print();

 ArrayList&lt;Integer&gt; al = tree.sort(); 

 System.out.println("sorted array : ");
 al.forEach(item -&gt; System.out.print(item + " "));
}
</code></pre>

}

I'm trying to make a program that consists of an array of 10 integers which all has a random value, so far so good.

However, now I need to sort them in order from lowest to highest value and then print it onto the screen, how would I go about doing so?

(Sorry for having so much code for a program that small, I ain't that good with loops, just started working with Java)

<pre><code>public static void main(String args[])
{
 int [] array = new int[10];

 array[0] = ((int)(Math.random()*100+1));
 array[1] = ((int)(Math.random()*100+1));
 array[2] = ((int)(Math.random()*100+1));
 array[3] = ((int)(Math.random()*100+1));
 array[4] = ((int)(Math.random()*100+1));
 array[5] = ((int)(Math.random()*100+1));
 array[6] = ((int)(Math.random()*100+1));
 array[7] = ((int)(Math.random()*100+1));
 array[8] = ((int)(Math.random()*100+1));
 array[9] = ((int)(Math.random()*100+1));

 System.out.println(array[0] +" " + array[1] +" " + array[2] +" " + array[3]
 +" " + array[4] +" " + array[5]+" " + array[6]+" " + array[7]+" " 
 + array[8]+" " + array[9] ); 

}
</code></pre>

Sort an array in Java

Java

我正在尝试编写一个程序，它由一个由10个整数组成的数组组成，每个整数都有一个随机值，到目前为止都很好。但是，现在我需要将它们从最低值到最高值排序，然后将其打印到屏幕上，我该怎么做呢？(很抱歉为这么小的程序编写了这么多代码，我不太擅长循环，我刚刚开始使用Java)public static void main(String args[]){    int [] array = new int[10]

问在Java中对数组排序
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