问Android studio项目中存在空指针无法导向打开？

2022-01-01 07:07:11.577 532-632/system_process E/WifiScoringParams: Invalid frequency(-1), using 5G as default rssi array at android.app.ActivityThread.main(ActivityThread.java:7656)

2022-01-01 07:08:33.426 3548-3548/com.example.n_test E/AndroidRuntime: FATAL EXCEPTION: main

2022-01-01 07:08:33.426 3548-3548/com.example.n_test E/AndroidRuntime: FATAL EXCEPTION: main

2022-01-01 07:08:33.426 3548-3548/com.example.n_test E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.n_test, PID: 3548

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.n_test/com.example.n_test.TWO}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3449)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601)

at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)

at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)

at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066)

at android.os.Handler.dispatchMessage(Handler.java:106)

at android.os.Looper.loop(Looper.java:223)

at android.app.ActivityThread.main(ActivityThread.java:7656)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

at com.example.n_test.TWO.onCreate(TWO.java:18)

at android.app.Activity.performCreate(Activity.java:7994)

at android.app.Activity.performCreate(Activity.java:7978)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3422)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3601) 

at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) 

at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) 

at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) 

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 

at android.os.Handler.dispatchMessage(Handler.java:106) 

at android.os.Looper.loop(Looper.java:223) 

at android.app.ActivityThread.main(ActivityThread.java:7656) 

at java.lang.reflect.Method.invoke(Native Method) 

at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592) 

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)