Need help in JAVA

[Nitish]

class Bubble
{
public static void main(String args[])
{
int arr1[] = {10,90,48,58};   //till here you have made 1 array called arr1 and it has 5 members namely, 10,90,48,58

for (int i=0;i<arr1.length;i++) 
System.out.print(arr1[i]+ "\t");  //here, you just displayed the array using a for loop. "\t" represents a tab. Its nothing but a displaying style, it will leave a  certain tabular space after displaying each member.

for(int i=0;i<(arr1.length-1);i++)  //here you started the sorting loop.starting with the 1st entry of array (10)
{
for (int j=i+1;j<arr1.length;j++) //here you started second loop starting with 2nd entry of array (90)
{
if(arr1[i]>arr1[j])  //here you are comparing 1st number with 2nd number in array to sort them in ASCENDING order. If the 1st >2nd you are replacing their order in the array. 
{
int x,y;
x=arr1[i];
y=arr1[j];
arr1[i] = y;
arr1[j] = x;
} 
}
}
System.out.println("\n");
System.out.println("Array after sorting in ascending order");
for (int i=0;i<arr1.length;i++) {  //printing the new array
System.out.print(arr1[i]+ "\t");
}
System.out.println();
}
}