摘要： public class Example3_2{public static void main(String arg[]){char a[]={'金','木','水','火','土'};char secret='z';for(int i=0;i<a.length;i++){a[i]=(char)(a[i]^secret);}System.out.printf("密文: \n");for(int i=0;i<a.length;i++){System.out.printf 阅读全文

摘要： import java.util.*;public class Example3_1{public static void main(String arg[]){Scanner reader=new Scanner(System.in);System.out.println("输入待移位的int整型数:");int x=reader.nextInt();System.out.println("输入移位量:");int n=reader.nextInt();System.out.println("左移位的结果:"+(x<<n 阅读全文

摘要： public class Example2_5{public static void main(String arg[]){int [] a={1,2,3};int [] b={10,11};System.out.println("数组a的引用:"+a);System.out.println("数组b的引用:"+b);System.out.printf("b[0]=%-3db[1]=%-3d\n",b[0],b[1]);b=a;System.out.println("数组a的引用:"+a);System.out.p 阅读全文

摘要： import java.util.*;public class Example2_4{public static void main(String arg[]){Scanner reader=new Scanner(System.in);double sum=0;int m=0;while(reader.hasNextDouble()){double x=reader.nextDouble();m=m+1;sum=sum+x;}System.out.printf("%d个数的和为%f\n",m,sum);System.out.printf("%d个数的平均值是%f 阅读全文

摘要： public class Example2_3{public static void main(String arg[]){char c='A';float f=123.456789f;double d=123456.12345678;long x=5678;System.out.printf("%c%n%10.3f%n%f,%12d%n%d",c,f,d,x,x=x+2);}} 阅读全文

摘要： public class Example2_2{public static void main(String arg[]){byte a=120;short b=130;int c=2200;long d=8000;float f;double g=0.1234567812345678;a=(byte)b;c=(int)d;f=(float)g;System.out.println("a="+a);System.out.println("c="+c);System.out.println("f="+f);System.out.prin 阅读全文

摘要： public class Example2_1{public static void main(String arg[]){char c='a';System.out.println(""+c+"unicode:"+(int)c);System.out.println(":");for(int i=(int)c;i<c+25;i++){System.out.println(""+(char)i);}}} 阅读全文