对调equals的左右值
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activity打开失败，Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference xxx 的问题分析与解决方案
Attempt to invoke interface method 'boolean java.util.List.add(java.lang.Object)' on a null object reference
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ActionBar.setDisplayShowHomeEnabled(boolean)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void 、Handler.removeMessages(int)' on a null object reference
Attempt to invoke virtual method 'int java.lang.Integer.intValue()' on a null object reference
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.List com.catherine.forrealm.about_utils.RealmHelper.findAllStudent()' on a null object reference
Android秒退并出现“java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.setTitle(java.lang.CharSequence)”时解决办法
ArrayMap java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Object[]
Java超类-java.lang.object