android.util.Pair

本文介绍如何利用Android中的Pair类来简化两个对象的组合与传递过程,并通过一个具体示例展示了Pair对象的创建和使用方法。

Container to ease passing around a tuple of two objects. This object provides a sensible implementation of equals(), returning true if equals() is true on each of the contained objects.


    private Pair<String, Integer> getPair(){
    	return new Pair<String, Integer>("hello", 123);
    }
    
    public void testPair() {
    	Pair<String, Integer> pair = getPair();
    	Log.e("scrat", pair.first);
    	Log.e("scrat", String.valueOf(pair.second));
    }


参考

http://developer.android.com/reference/android/util/Pair.html

01-01 03:26:53.064 9938 9938 E AndroidRuntime: java.lang.RuntimeException: Unable to create service com.qinggan.app.service.RdsRemoteLogService: java.lang.RuntimeException: java.lang.NullPointerException: HostKeyProvider not set 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:4498) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.app.ActivityThread.-$$Nest$mhandleCreateService(Unknown Source:0) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2160) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:106) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.os.Looper.loopOnce(Looper.java:201) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.os.Looper.loop(Looper.java:288) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7918) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:946) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: Caused by: java.lang.RuntimeException: java.lang.NullPointerException: HostKeyProvider not set 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at com.qinggan.app.util.SFTPServer.startFtpServer(SFTPServer.java:164) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at com.qinggan.app.service.RdsRemoteLogService.onCreate(RdsRemoteLogService.java:45) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:4485) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: ... 9 more 01-01 03:26:53.064 9938 9938 E AndroidRuntime: Caused by: java.lang.NullPointerException: HostKeyProvider not set 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at java.util.Objects.requireNonNull(Objects.java:245) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at org.apache.sshd.server.SshServer.checkConfig(SshServer.java:283) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at org.apache.sshd.server.SshServer.start(SshServer.java:309) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: at com.qinggan.app.util.SFTPServer.startFtpServer(SFTPServer.java:162) 01-01 03:26:53.064 9938 9938 E AndroidRuntime: ... 11 more
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