我想要这个类的对象:
public class Chromosome implements Runnable, Comparable<Chromosome> {
private String[] chromosome;
public double fitness;
private Random chromoGen;
public Chromosome(double[] candidate) {
super();
//encode candidate PER parameter; using Matrix as storage
chromosome = encode(candidate);
chromoGen = new Random();
}
//De-fault
public Chromosome() {
super();
chromoGen = new Random();
//de-fault genotype
chromosome = new String[6];
}
/**
* IMPLEMENTED
*/
public void run() {
//I hope leaving it empty works...
}
public int compareTo(Chromosome c) {
return (int) (fitness - c.fitness);
}
/**
* Fitness stored in chromosome!
*/
public void setFitness(ArrayList<double[]> target) {
fitness = FF.fitness(this, target);
}
public double getFitness() {
return fitness;
}
/**
* ENCODERS/DECODERS
*/
public String[] encode(double[] solution) {
//subtract 2^n from solution until you reach 2^-n
/**
* LENGTH: 51 BITS!!
*
* 1st BIT IS NEGATIVE/POSITIVE
*
* THE PRECISION IS [2^30 <-> 2^-20]!!!
*
* RANGE: -2.14748...*10^9 <-> 2.14748...*10^9
*/
String[] encoded = new String[6];
//PER PARAMETER
for (int j = 0; (j < 6); j++) {
encoded[j] = encode(solution[j]);
}
return encoded;
}
public String encode(double sol) {
/**
* THE PRECISION IS [2^30 <-> 2^-20]!!!
*/
double temp = sol;
String row = "";
//NEGATIVITY CHECK
if (temp < 0) {
//negative
row = "1";
} else {
//positive
row = "0";
}
//main seq.
for (int n = 30; (n > (-21)); n--) {
if ((temp - Math.pow(2, n)) >= 0) {
temp = temp - Math.pow(2, n);
row = row + "1";
} else {
row = row + "0";
}
}
return row;
}
public double decoded(int position) {
//returns UN-ENCODED solution
double decoded = 0.00;
char[] encoded = (chromosome[position]).toCharArray();
/**
* [n?][<--int:30-->][.][<--ratio:20-->]
*/
int n = 30;
for (int i = 1; (i < encoded.length); i++) {
if (encoded[i] == '1') {
decoded += Math.pow(2, n);
}
//next binary-place
n--;
}
//NEGATIVE??
if (encoded[0] == '1') {
decoded = ((-1) * decoded);
}
//Output
return decoded;
}
/**
* GETTERS
* ---------------\/--REDUNDANT!!
*/
public double getParameter(int parameter) {
//decoded solution
return decoded(parameter);
}
/**
* Used in E-algrm.
*/
public String getRow(int row) {
//encoded solution
return chromosome[row];
}
/**
* SETTERS
*/
public void setRow(String encoded, int row) {
chromosome[row] = encoded;
}
public void setRow(double decoded, int row) {
chromosome[row] = encode(decoded);
}
/**
* MUTATIONS
*/
public void mutate(double mutationRate) {
//range of: 51
double ran = 0;
int r;
char[] temp;
for (int m = 0; (m < 6); m++) {
temp = (chromosome[m]).toCharArray();
ran = chromoGen.nextDouble();
if (ran <= mutationRate) {
r = chromoGen.nextInt(51);
if (temp[r] == '1') {
temp[r] = '0';
} else {
temp[r] = '1';
}
}
//output
chromosome[m] = new String(temp);
}
}
}
...处于单独的线程中;但是我不需要这个方法run()
;但是当我尝试这样做时:
child1 = new Chromosome();
(new Thread(child1)).start();
尽管如此,我在运行时看到的唯一线程是main()
。
那么,我怎样才能让它分离线程呢?
我发现您对线程工作原理的理解存在问题。
当你创建一个线程时,它会寻找方法run()
。创建线程有多种方法。我通过传递一个来做到这一点Runnable
object.
Thread t=new Thread (new Runnable);
你知道线程的寿命有多长吗?
- 线程与方法一样长
run()
存在并运行。线程只执行内部的代码run()
方法。它并不是为了执行外部的任何事情而设计的run()
。当控制移出时线程死亡run()
.
您的案例:
你离开了run()
方法为空。因此,线程不执行任何操作,并在创建时死亡。
你能做什么?
将程序的其余部分包含在run()
以便run()
保留在堆上,因此新创建的线程运行该程序。
你不需要把一切都投入run()
,您可以简单地将第一个方法调用转移到run()
以便它保留在堆上。
让我们举个例子:
public class threading implements Runnable
{
public static void main(String args[])
{
Thread t = new Thread (new Runnable);
t.setName("thread1");
t.start();
print1();
print2();
}
public static void print2()
{
System.out.println(Thread.getName());
}
public static void print1()
{
System.out.println(Thread.getName());
}
public void run()
{
System.out.println(Thread.getName());
}
}
Ouputs:
是时候让你的新线程保持活力直到最后了。
public class threading implements Runnable
{
public static void main(String args[])
{
Thread t = new Thread (new Runnable);
t.setName("thread1");
t.start();
}
public static void print2()
{
System.out.println(Thread.getName());
}
public static void print1()
{
System.out.println(Thread.getName());
print2();
}
public void run()
{
System.out.println(Thread.getName());
print1();
}
}
Output:
我们保留了方法run()
通过放入方法调用来在堆上run()
。这种方法是进一步保持流量的方法。
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