java编程思想课后答案
【篇一：java编程思想第六章习题答案】
ava
tkd
// tij4 chapter arrays, exerci 10, page 762beef什么意思
// modify arrayofgeneric.java to u containers instead of arrays.
// show that you can eliminate the compile-time warnings.
import java.util.*;
public class arrayofgenerics10 {
}
// arrays/containercomparison15.java
// tij4 chapter arrays, exerci 15, page 775
// modify containercomparison.java by creating a generator for
// berylliumsphere, and change main() to u that generator
// with generated.array().
import net.mindview.util.*;
import java.util.*;
import static net.mindview.util.print.*;
class berylliumspheregenerator implements generatorberylliumsphere {
}
public berylliumsphere next() { return new berylliumsphere(); }@suppresswarnings(unchecked) public static void main(string[] args) { } listliststring lls = new arraylistliststring(); listlist l = new arraylistlist(); // lls = (listlis
tstring)l; // error: inconvertible types lls.add(new arrayliststring()); listobject lo = new arraylistobject(); // lo = lls; // error: incompatible types // compile-time warning eliminated: listlistberylliumsphere llb =new arraylistlistberylliumsphere(); for(int i = 0; i 10; i++) {llb.add(new arraylistberylliumsphere()); for(int j = 0; j 2; j++) (i).add(new berylliumsphere()); } system.out.println(llb);
public class containercomparison15 {
}
// reusing/sterilizer.java
// tij4 chapter reusing, exerci 2, page 243
proudof>江畔独步寻花其六 /* inherit a new class from class detergent. override scrub() and add a new method * called sterilize().
*/
import ls.print.*;
public class sterilizer extends detergent {
}
// arrays/testarraygeneration16.java
// tij4 chapter arrays, exerci 16, page 775
/* starting with countinggenerator.java, create a skipgenerator class public void scrub() { append( sterilizer.scrub()); } public void sterilize() { append( sterilize()); } public static void main(string[] args) { sterilizer x = new sterilizer(); x.dilute(); } x.apply(); x.scrub(); x.foam(); x.sterilize(); println(x); println(testing ba class:); detergent.main(args); public static void main(string[] args) { berylliumsphere[] spheres = new berylliumsphere[5]; berylliumspheregenerator bsg = new berylliumspheregenerator(); generated.array(spheres, bsg);} string(spheres)); print(spheres[4]); listberylliumsphere spherelist =
new arraylistberylliumsphere(); for(int i = 0; i 5; i++) spherelist.()); print(spherelist); (4));
* that produces new values by incrementing according to a constructor * argument. modify testarraygeneration.java to show that your new * class works correctly.
*/
import java.util.*;
import net.mindview.util.*;
import static net.mindview.util.print.*;
public class testarraygeneration16 {
} public static void main(string[] args) {} int size = 6; int skip = 7; boolean[] a1 = convertto.primitive(generated16.array( new boolean[size], new skipgenerator16.bo
olean(skip), skip)); print(a1 = + string(a1)); byte[] a2 = convertto.primitive(generated16.array( new byte[size], new skipgenerator16.byte(skip), skip)); print(a2 = + string(a2)); char[] a3 = convertto.primitive(generated16.array( new character[size], new skipgenerator16.character(skip), skip)); print(a3 = + string(a3)); short[] a4 = convertto.primitive(generated16.array( new short[size], new skipgenerator16.short(skip), skip)); print(a4 = + string(a4)); int[] a5 = convertto.primitive(generated16.array( new integer[size], new skipgenerator16.integer(skip), skip)); print(a5 = + string(a5)); long[] a6 = convertto.primitive(generated16.array( new long[size], new skipgenerator16.long(skip), skip)); print(a6 = + string(a6)); float[] a7 = convertto.primitive(generated16.array( new float[size], new skipgenerator16.float(skip), skip)); print(a7 = + string(a7)); double[] a8 = convertto.primitive(generated16.array( new double[size], new skipgenerator16.double(skip), skip)); print(a8 = + string(a8));
// solution includes, in same package:
/***************************
import net.mindview.util.*;
4级听力 interface skipgeneratort extends net.atort {t next();
t next(int n);
}
public class skipgenerator16 {
public static class
boolean implements skipgeneratorjava.lang.boolean { private boolean value = fal;
private int n; boolean(int n) { this.n = n; }
public java.lang.boolean next() { return !value; }
public java.lang.boolean next(int n) {
value = n % 2 == 0 ? true : fal;
return value;
}
}
public static class
byte implements skipgeneratorjava.lang.byte {
private byte value = 0;内库
private int n;
byte(int n) { this.n = n; }
public java.lang.byte next() { return value++; }
public java.lang.byte next(int n) { return value += n; }
}
static char[] chars = (abcdefghijklmnopqrstuvwxyz +
abcdefghijklmnopqrstuvwxyz).tochararray();
西点烘焙培训班 public static class
character implements skipgeneratorjava.lang.character { int index = -1;
private int n;
character() { int index = -1; } character(int n) { this.n = n; }
public java.lang.character next() {
index = (index + 1) % chars.length;
return chars[index];
汉办网
}
public java.lang.character next(int n) {西安培华学院地址
index = (index + 1 + n) % chars.length;
return chars[index];
}
}
public static class
string implements skipgeneratorjava.lang.string { private int length = 7;
skipgeneratorjava.lang.character cg = new character(); public string() {}
public string(int length) { this.length = length; } public java.lang.string next() {
trivial char[] buf = new char[length];
for(int i = 0; i length; i++)
buf[i] = cg.next();
return new java.lang.string(buf);
}
public java.lang.string next(int n) { char[] buf = new char[length]; for(int i = 0; i length; i++) buf[i] = cg.next(n); return new java.lang.string(buf);
