Java Java Java Java Java 4 p * * * * * Unix p a,b,c,d 100,200,250,500 ab = ab+c = ab+cd = (a+b)*(c+d) = 225

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1 Java Java Java Java Java 4 p * *** ***** *** * Unix p a,b,c,d 100,200,250,500 a*b = a*b+c = a*b+c*d = (a+b)*(c+d) = a+b*c+d = b/a+d/c = 4 p (1) mul = 1 (2) mul = 2 (3) mul = 4 (4) mul = 8 (5) mul = 16 (1)3 (2)9 (3)27 (4)81 (5)243

2 (1)sum = 1 p (2)sum = 3 3 (3)sum = 6 OK (4)sum = 10 p62 if((x % 3)==0){ (5)sum = 15 // p42 p43 A) p43 p44 public class BooleanTest{ 5 boolean b1,b2,b3; b1 = 2>1; b2 = 1>2; boolean = b3 = true; true if(b1==true){ = false System.out.println("2>1 holds"); if(b2==true){ System.out.println("1>2 holds"); if(b3){ System.out.println("true");

3 public class JbVar1{ char ch; ch = 'A'; System.out.println("moji = " + ch +,code = " + (int)ch); ch = 66; System.out.println("moji = " + ch +,code = " + (int)ch); ch = '; System.out.println("moji = " + ch +,code = " + (int)ch); ch = 20140; System.out.println("moji = " + ch +,code = " + (int)ch); public class JbVar2{ byte bt; short s; int i; long l; bt = 127; s = 32760; i = ; l = L; System.out.println("byte = " + bt); System.out.println("short = " + s); System.out.println("int = " + i); System.out.println("long = " + l);

4 double OK public class JbVar3{ float f; double d; f = F; d = ; System.out.println("float = " + f); System.out.println("double = " + d); f = 100.0F/3.0F; d = 100.0/3.0; System.out.println("float = " + f); System.out.println("double = " + d); a1 a2 public class JbVar31{ int[] a1 = {1,2; int[] a2 = a1; System.out.println("a1[0] = " + a1[0] + ", a1[1] = " + a1[1]) ; System.out.println("a2[0] = " + a2[0] + ", a2[1] = " + a2[1]) ; a1[1] = 5; System.out.println("a1[0] = " + a1[0] + ", a1[1] = " + a1[1]) ; System.out.println("a2[0] = " + a2[0] + ", a2[1] = " + a2[1]) ;

5 p p p63 public class JaEnza11{ double ddt; ddt = 10 / 4; System.out.println("ddt = " + ddt); ddt = 10.0 / 4.0; System.out.println("ddt = " + ddt); ddt = 10.0 / 4; System.out.println("ddt = " + ddt); ddt = 10 / 4.0; System.out.println("ddt = " + ddt); 6.3 p63 public class JaEnza12{ int a; a = ( ) * 30; System.out.println("a = " + a); a = 100 / 20 / 5; System.out.println("a = " + a); a = 100 / (20 / 5); System.out.println("a = " + a); a = 100 / 20 * 5; System.out.println("a = " + a); a = 100 / (20 * 5); System.out.println("a = " + a); a = / 5; System.out.println("a = " + a);

6 6.4 public class JaEnza13{ int a = 0; int b = 0; int c = 1; double d = 1.0; for(int i=0;i<5;i++){ System.out.println(" i = " + i); a += i; System.out.println("a = " + a); b -= 2; System.out.println("b = " + b); c *= 3; System.out.println("c = " + c); d /= 3; System.out.println("d = " + d); 6.5 p p String 6.9 public class JaEnza31{ String s = ""; for(int i=0;i<5;i++){ System.out.println(" i = " + i); s += i; System.out.println("s = " + s); if(s.equals("012")){ System.out.println("s equals "0123 "");

7 ----- i = 0 s = a i = 1 s = a0a i = 2 s = a0a1a2 s eqauls a0a1a i = 3 s = a0a1a2a i = 4 s = a0a1a2a3a4 6.8 p if p for p84 p while p88 while do-while p91 do-while

8 switch p94 p96 p98 for switch % ( p62) (1) [2] <3> (4) [5] <6> (7) [8] <9> (10) 7.6 break p100 p while break % ( p62) continue p106 for continue for(...){ for(...){ if(...)...; for(...){ p112

9 for p abcde p120 abcde fghi fghi 3 jklm jklm 9.2 p124 end break String p p

10 p p135 a=111 b=222 b= p p abcd public class JaMet31{ abcd 3 public static void main(...){ e e 3 public static boolean Cmp3(...){ fgh fhg 3 p143 boolean p264 ss = abcdef ; x = ss.length(); x p p147 11

11 p157 HDD FDD HDD1428 p158 30

K227 Java 2

1 K227 Java 2 3 4 5 6 Java 7 class Sample1 { public static void main (String args[]) { System.out.println( Java! ); } } 8 > javac Sample1.java 9 10 > java Sample1 Java 11 12 13 http://java.sun.com/j2se/1.5.0/ja/download.html