Language: Java

import java.util.Scanner;

public class icpc2006 {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);

		int test;
		test = scan.nextInt();
		String push;

		int onepush;
		String word;
		int samepushnumber;
		char preword = ' ';
		String[] result = new String[100];

		for (int i = 0; i < test; i++) {
			push = scan.next();

			samepushnumber = 0;
			word = "";

			for (int j = 0; j < push.length(); j++) {
				onepush = push.charAt(j) - '0';
				switch (onepush) {
				case 0:
					if (samepushnumber > 0)
						word += preword;
					samepushnumber = 0;

					break;
				case 1:
					samepushnumber++;
					if (samepushnumber % 5 == 1) {
						preword = '.';
					} else if (samepushnumber % 5 == 2) {
						preword = ',';
					} else if (samepushnumber % 5 == 3) {
						preword = '!';
					} else if (samepushnumber % 5 == 4) {
						preword = '?';
					} else if (samepushnumber % 5 == 0) {
						preword = ' ';
					}
					break;
				case 2:
					samepushnumber++;
					if (samepushnumber % 3 == 1) {
						preword = 'a';
					} else if (samepushnumber % 3 == 2) {
						preword = 'b';
					} else if (samepushnumber % 3 == 0) {
						preword = 'c';
					}
					break;
				case 3:
					samepushnumber++;
					if (samepushnumber % 3 == 1) {
						preword = 'd';
					} else if (samepushnumber % 3 == 2) {
						preword = 'e';
					} else if (samepushnumber % 3 == 0) {
						preword = 'f';
					}
					break;
				case 4:
					samepushnumber++;
					if (samepushnumber % 3 == 1) {
						preword = 'g';
					} else if (samepushnumber % 3 == 2) {
						preword = 'h';
					} else if (samepushnumber % 3 == 0) {
						preword = 'i';
					}
					break;
				case 5:
					samepushnumber++;
					if (samepushnumber % 3 == 1) {
						preword = 'j';
					} else if (samepushnumber % 3 == 2) {
						preword = 'k';
					} else if (samepushnumber % 3 == 0) {
						preword = 'l';
					}
					break;
				case 6:
					samepushnumber++;
					if (samepushnumber % 3 == 1) {
						preword = 'm';
					} else if (samepushnumber % 3 == 2) {
						preword = 'n';
					} else if (samepushnumber % 3 == 0) {
						preword = 'o';
					}
					break;
				case 7:
					samepushnumber++;
					if (samepushnumber % 4 == 1) {
						preword = 'p';
					} else if (samepushnumber % 4 == 2) {
						preword = 'q';
					} else if (samepushnumber % 4 == 3) {
						preword = 'r';
					} else if (samepushnumber % 4 == 0) {
						preword = 's';
					}

					break;
				case 8:
					samepushnumber++;
					if (samepushnumber % 3 == 1) {
						preword = 't';
					} else if (samepushnumber % 3 == 2) {
						preword = 'u';
					} else if (samepushnumber % 3 == 0) {
						preword = 'v';
					}

					break;
				case 9:
					samepushnumber++;
					if (samepushnumber % 4 == 1) {
						preword = 'w';
					} else if (samepushnumber % 4 == 2) {
						preword = 'x';
					} else if (samepushnumber % 4 == 3) {
						preword = 'y';
					} else if (samepushnumber % 4 == 0) {
						preword = 'z';
					}

					break;
				}
			}

			result[i] = word;

		}

		for (int i = 0; i < test; i++) {
			System.out.println(result[i]);
		}

	}
}

Compiler output:
Main.java:3: error: class icpc2006 is public, should be declared in a file named icpc2006.java
public class icpc2006 {
       ^
1 error