給出的Java下面的代碼,編譯時u有很多誤區:錯誤:包com.google.common.base不存在
Main.java:1: error: package com.google.common.base does not exist import com.google.common.base.Preconditions; ^
Main.java:2: error: package com.google.common.collect does not exist import com.google.common.collect.Lists; ^
Main.java:3: error: package org.ros.exception does not exist import org.ros.exception.RosRuntimeException; ^
Main.java:4: error: package org.ros.internal.loader does not exist import org.ros.internal.loader.CommandLineLoader; ^
Main.java:5: error: package org.ros.node does not exist import org.ros.node.DefaultNodeMainExecutor; ^
Main.java:6: error: package org.ros.node does not exist import org.ros.node.NodeConfiguration; ^
Main.java:7: error: package org.ros.node does not exist import org.ros.node.NodeMainExecutor;
我通過的IntelliJ運行它。有誰知道它爲什麼不起作用?
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import org.ros.exception.RosRuntimeException;
import org.ros.internal.loader.CommandLineLoader;
import org.ros.node.DefaultNodeMainExecutor;
import org.ros.node.NodeConfiguration;
import org.ros.node.NodeMainExecutor;
// This class will run a publisher and subscriber, and relay data between them.
public class Main {
static private Talker pubNodeMain;
static private Listener subNodeMain;
public static void main(String[] argv) throws Exception {
// Set up the executor for both of the nodes
NodeMainExecutor nodeMainExecutor = DefaultNodeMainExecutor.newDefault();
// Load the publisher
String[] pubArgv = {"Talker"};
CommandLineLoader pubLoader = new CommandLineLoader(Lists.newArrayList(pubArgv));
String nodeClassName = pubLoader.getNodeClassName();
System.out.println("Loading node class: " + pubLoader.getNodeClassName());
NodeConfiguration pubNodeConfiguration = pubLoader.build();
try {
pubNodeMain = (Talker) pubLoader.loadClass(nodeClassName);
} catch (ClassNotFoundException e) {
throw new RosRuntimeException("Unable to locate node: " + nodeClassName, e);
} catch (InstantiationException e) {
throw new RosRuntimeException("Unable to instantiate node: " + nodeClassName, e);
} catch (IllegalAccessException e) {
throw new RosRuntimeException("Unable to instantiate node: " + nodeClassName, e);
}
Preconditions.checkState(pubNodeMain != null);
nodeMainExecutor.execute(pubNodeMain, pubNodeConfiguration);
// Load the subscriber
String[] subArgv = {"Listener"};
CommandLineLoader subLoader = new CommandLineLoader(Lists.newArrayList(subArgv));
nodeClassName = subLoader.getNodeClassName();
System.out.println("Loading node class: " + subLoader.getNodeClassName());
NodeConfiguration subNodeConfiguration = subLoader.build();
try {
subNodeMain = (Listener) subLoader.loadClass(nodeClassName);
} catch (ClassNotFoundException e) {
throw new RosRuntimeException("Unable to locate node: " + nodeClassName, e);
} catch (InstantiationException e) {
throw new RosRuntimeException("Unable to instantiate node: " + nodeClassName, e);
} catch (IllegalAccessException e) {
throw new RosRuntimeException("Unable to instantiate node: " + nodeClassName, e);
}
Preconditions.checkState(subNodeMain != null);
nodeMainExecutor.execute(subNodeMain, subNodeConfiguration);
}
}
你可能嘗試導入這些包下的包,而不是自己的班。例如,嘗試爲第一個錯誤添加'import static com.google.com.base.Preconditions。*'。 – chesh
對maven或gradle的廣告依賴,然後'gradlew idea'或'maven clean build'並在Intellij中點擊File - > Invalidate cahces/Restart –