/** * This class represents a DNA sequence of nucleotides 'A', 'T', 'C' and 'G' * as a sequence of characters in a {@link String} object. * * @author author name * @version 1.0.0 */public class DNASequence {
/* Contains the sequence of nucleotides. */ private String sequence;
/* Contains the number of nucleotide A */ private int numberOfA;
/* Contains the number of nucleotide T */ private int numberOfT;
/* Contains the number of nucleotide C */ private int numberOfC;
/* Contains the number of nucleotide G */ private int numberOfG;
/** * Test driver for class <code>DNA</code>. * * @param args not used. */ public static void main(String[] args) {
String s = "ATTATCGGGGTAA"; DNASequence dnaSequence = new DNASequence(s);
if ((dnaSequence.getNumberOfA() == 4) && (dnaSequence.getNumberOfT() == 4) && (dnaSequence.getNumberOfC() == 1) && (dnaSequence.getNumberOfG() == 4)) { System.out.println("Test case 1: get methods passed/n"); } else { System.out.println("Test case 1: get methods failed !!!/n"); }
if (dnaSequence.twoConsecutive('T')) { System.out.println("Test case 2: method twoConsecutive passed/n"); } else { System.out.println( "Test case 2: method twoConsecutive failed !!!/n"); }
if (dnaSequence.twoConsecutive('A')) { System.out.println("Test case 3: method twoConsecutive passed/n"); } else { System.out.println( "Test case 3: method twoConsecutive failed !!!/n"); }
if (!dnaSequence.twoConsecutive('C')) { System.out.println("Test case 4: method twoConsecutive passed/n"); } else { System.out.println( "Test case 4: method twoConsecutive failed !!!/n"); } }
/** * Constructs a <code>DNASequence</code> object that represents the sequence * of nucleotides indicated by the chars in the <code>string</code> argument * and counts the occurrences of each nucleotide in the sequence. * * @param initialSequence a string with the initial sequence of nucleotides. */ public DNASequence(String initialSequence) {
sequence = initialSequence; countNucleotides(); }
/* * Counts the occurrences of each nucleotide in the DNA sequence and then * updates the values of the variables numberOfA, numberOfT, numberOfC, and * numberOfG . */ private void countNucleotides() {
/* int numberOfA = 0; int numberOfT = 0; int numberOfC = 0; int numberOfG = 0; */ numberOfA = 0; numberOfT = 0; numberOfC = 0; numberOfG = 0;
int index = 0;
while (index < sequence.length()) {
char nucleotide = sequence.charAt(index);
if (nucleotide == 'A') { numberOfA++; } else if (nucleotide == 'T') { numberOfT++; } else if (nucleotide == 'C') { numberOfC++; }/* else if (nucleotide == 'G') { numberOfC++; } */ else if (nucleotide == 'G') { numberOfG++; } index++; }
return; }
/** * Obtains the number of occurrences of nucleotide A in the sequence. * * @return the number of occurrences of nucleotide A. */ public int getNumberOfA( ) {
return numberOfA; }
/** * Obtains the number of occurrences of nucleotide T in the sequence. * * @return the number of occurrences of nucleotide T. */ public int getNumberOfT( ) {
return numberOfT; }
/** * Obtains the number of occurrences of nucleotide C in the sequence. * * @return the number of occurrences of nucleotide C. */ public int getNumberOfC( ) {
return numberOfC; }
/** * Obtains the number of occurrences of nucleotide G in the sequence. * * @return the number of occurrences of nucleotide G. */ public int getNumberOfG( ) {
return numberOfG; }
/** * Checks if the nucleotide specified by the argument occurs in two * consecutive locations in the DNA sequence. * * @param input a <code>char</code> that represent the nucleotide. * @return <code>true</code> if the specified nucleotide occurs two * consecutive locations in the sequence. * Returns <code>false</code> otherwise. */ public boolean twoConsecutive(char input) {
int index = 1;
/* while (index < sequence.length() - 1) { */ while (index < sequence.length()) {
int indexOfFirstNucleotide = index - 1;
char firstNucleotide = sequence.charAt(indexOfFirstNucleotide); char secondNucleotide = sequence.charAt(index);
/* if ((firstNucleotide == input) || (secondNucleotide == input)) {
return true;
} */ if ((firstNucleotide == input) && (secondNucleotide == input)) {
return true;
} index++; }
return false; }}
考察：
对程序进行调试。
调试的快捷操作：F5 起调试
F9 设断点
F10 断点处开始调试 跳过函数
F11 进入函数内部
