need java programs
i need some programs to learn and have some doubts in java and j2ee,so experts help me to solve my doubts
i need a programe in java ie
1.remove duplicate elements from array without using collections?
2)2,10,15,2 add the elements in command line argument and remove duplicates?
3)Given two arrays, 1,2,3,4,5 and 2,3,1,0,5 find which number is not present in the second array.
4)How do you find second highest number in an integer array?