如何将参数传递给Java线程?
我的程序不起作用,如何改进我的示例 在这个代码中是错误的。Eclipse说,如何将参数传递给Java线程?,java,multithreading,parameters,Java,Multithreading,Parameters,我的程序不起作用,如何改进我的示例 在这个代码中是错误的。Eclipse说,无法实例化行中的Synchro类型:Runnable threadTask=new Synchro(param1,param2) 另一个文件中的类Synchro:(此代码适用于Eclipse) 我想你的Synchro类应该是这样的 public class Synchro implements Runnable { private String argument1; private String argu
无法实例化行中的Synchro类型:Runnable threadTask=new Synchro(param1,param2)代码>
另一个文件中的类Synchro
:(此代码适用于Eclipse)
我想你的Synchro
类应该是这样的
public class Synchro implements Runnable {
private String argument1;
private String argument2;
// the arguments pass by constructor
public Synchro(String argument1, String argument2) {
this.argument1 = argument1;
this.argument2 = argument2;
}
// you have to override run method, when you implement Runnable interface
@Override
public void run() {
// your code
}
}
以下是另一种在Java8中工作的方法:
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
synchronizuj.setEnabled(false);
final String param1 = main_catalog.getText();
final String param2 = copy_catalog.getText();
Thread newThread = new Thread (() -> {
...code to be executed in the thread goes here.
It can refer to param1 and param2,
but it can not change them...
});
newThread.start();
}
});
new Thread(…)
的参数是一个lambda表达式——一种定义和实例化实现函数接口的匿名内部类的紧凑方式(注意:Runnable
在Java8中被重新定义为函数接口。)将其传递给构造函数。Synchro
是抽象的。当然你不能实例化它。在我的例子中,最简单的方法是添加构造函数,还是其他方法?没有抽象类我能做到吗?是的。你为什么认为Synchro
必须是abstract
?
public class Synchro implements Runnable {
private String argument1;
private String argument2;
// the arguments pass by constructor
public Synchro(String argument1, String argument2) {
this.argument1 = argument1;
this.argument2 = argument2;
}
// you have to override run method, when you implement Runnable interface
@Override
public void run() {
// your code
}
}
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
synchronizuj.setEnabled(false);
final String param1 = main_catalog.getText();
final String param2 = copy_catalog.getText();
Thread newThread = new Thread (() -> {
...code to be executed in the thread goes here.
It can refer to param1 and param2,
but it can not change them...
});
newThread.start();
}
});