Java第六新版章程序清单
习题6.2(求一个整数各位数之和) import java.util.Scanner; public class sumIf { public static void main(String[] args) { // TODO Auto-generated stub System.out.print(“请输入一个整数:“); Scanner = new Scanner(System.in); long n = .nextInt(); System.out.print(“输入整数i=“ + n + “各个数字和是“ + sumDigits(n)); } public static long sumDigits(long k){ long sum = 0; while( k != 0) { sum += k % 10; k /= 10; } return sum; } } 习题6.4(反向显示一个整数) import java.util.Scanner; public class reverse { public static void main(String[] args) { // TODO Auto-generated stub System.out.print(“请输入一个整数“); Scanner = new Scanner(System.in); int number1 = .nextInt(); reverse(number1); } public static int reverse(int number) { int i; while(number != 0){ System.out.print(number%10); number /= 10; } return 0; } } 习题6.6(显示图案,此方法只能在10以内对其) import java.util.*; public class displayPattern1 { public static void main(String[] args) { // TODO Auto-generated stub System.out.print(“请输入一个整数“); Scanner = new Scanner(System.in); int n = .nextInt(); displayPattern(n); } public static void displayPattern(int i) { for(int j = 1; j 0; k--) { System.out.print(k + “ “); } System.out.println(); } } } 程序清单6-1(调用max方法) public class TestMax { public static void main(String[] args) { // TODO Auto-generated stub int i = 5; int j = 2; int k = max(i, j); System.out.println(“the maxinum of “ + i + “ and “ + j + “ is “ + k); } public static int max(int num1, int num2) { int result; if (num1 > num2) result = num1; else result = num2; return result; } } 程序清单6-2(void方法示例,打印给定分数等级) public class TestVoid { public static void main(String[] args) { // TODO Auto-generated stub System.out.print(“The grade is “); printGrade(78.5); System.out.print(“The grade is “); printGrade(59.5); } public static void printGrade(double score) { if(score >=90.0) { System.out.println( A ); } else if(score >=80.0) { System.out.println( B ); } else if(score >=70.0) { System.out.println( C ); } else if(score >=60.0) { System.out.println( D ); } else { System.out.println( F ); } } } 程序清单6-3(void方法示例,和程序清单做对比,打印一个分数等级) public class TestReturnVoid { public static void main(String[] args) { System.out.print(“The frade is “ + getGrade(78.5)); System.out.print(“\nThe frade is “ + getGrade(59.5)); } public static char getGrade(double score) { if (score >= 90) return A ; else if (score >= 80) return B ; else if (score >= 70) return C ; else if (score >= 60) r