equals

问题 I'm having a strange problem in some of my php. What seems to be happening is that 0 is being shown as equal to the string "done". Here's what's happening: if(!isset($pointer)){ $pointer = 0; } error_log($pointer); //in this instance, I haven't set a pointer, returns 0 if($pointer == "done"){ die(); } For some reason, the second if statement is triggering and killing the script. I can't figure out why, when $pointer is equal to 0, it is apparently also equal to "done". Is this something super

问题 I'm having a strange problem in some of my php. What seems to be happening is that 0 is being shown as equal to the string "done". Here's what's happening: if(!isset($pointer)){ $pointer = 0; } error_log($pointer); //in this instance, I haven't set a pointer, returns 0 if($pointer == "done"){ die(); } For some reason, the second if statement is triggering and killing the script. I can't figure out why, when $pointer is equal to 0, it is apparently also equal to "done". Is this something super

问题 I am trying to do something in an if-statement, this works in every version of android (16 or higher because of the getDrawable) except Android L (tested on latest). The code is the following: if (item.getIcon().getConstantState().equals(getResources().getDrawable(R.drawable.add_to_fav_normal).getConstantState()) Any help/hints or explanation would be appreciated! 回答1: Use item.getContext().getDrawable(int) or the equivalent ContextCompat method. Starting in API 21, all framework widgets that

问题 I'm testing if an Object is equals than a specific class type. For example: @Override public void itemStateChanged(ItemEvent e) { if (e.getStateChange() == ItemEvent.SELECTED) { Object sourceObject = e.getSource(); if (sourceObject.getClass() == JComboBox.class.getClass()) { @SuppressWarnings("unchecked") JComboBox<String> jComboBox = (JComboBox<String>) sourceObject; So, what comparison method should I use? sourceObject.getClass() == JComboBox.class.getClass() or sourceObject.getClass() ==

问题 I have a class: public abstract class AbstractDictionaryObject { public virtual int LangId { get; set; } public override bool Equals(object obj) { if (obj == null || obj.GetType() != GetType()) { return false; } AbstractDictionaryObject other = (AbstractDictionaryObject)obj; if (other.LangId != LangId) { return false; } return true; } public override int GetHashCode() { int hashCode = 0; hashCode = 19 * hashCode + LangId.GetHashCode(); return hashCode; } And I have derived classes: public

问题 I have this code: public class Tray { private Set<Block> blocks; private int numColumns; private int numRows; //constructor public Tray (int numRows, int numColumns){ this.numColumns = numColumns; this.numRows = numRows; blocks = new HashSet<>(); } public boolean satisfiesGoal(Tray other){ Block thisBlock = this.blocks.iterator().next(); Block otherBlock = other.blocks.iterator().next(); boolean hashesEqual = thisBlock.hashCode() == otherBlock.hashCode(); // this is true boolean areEqual =

问题 Consider this code: int a = 0; short b = 0; int c = 0; object a1 = a; object b1 = b; object c1 = c; Console.WriteLine(1); //comparing primitives - int vs. short Console.WriteLine(a == b); Console.WriteLine(b == a); Console.WriteLine(a.Equals(b)); Console.WriteLine(b.Equals(a)); Console.WriteLine(2); //comparing objects - int vs. int Console.WriteLine(c1 == a1); Console.WriteLine(a1 == c1); Console.WriteLine(c1.Equals(a1)); Console.WriteLine(a1.Equals(c1)); Console.WriteLine(3); //comparing

问题 Suppose I have a factor A with 3 levels A1, A2, A3 and with NA's. Each appears in 10 cases, so there is a total of 40 cases. If I do subset1 <- df[df$A=="A1",] dim(subset1) # 20, i.e., 10 for A1 and 10 for NA's summary(subset1$A) # both A1 and NA have non-zero counts subset2 <- df[df$A %in% c("A1"),] dim(subset2) # 10, as expected summary(subset2$A) # only A1 has non-zero count And it is the same whether the class of the variable used for subsetting is factor or integer. Is it just how equal

问题 Suppose I have a factor A with 3 levels A1, A2, A3 and with NA's. Each appears in 10 cases, so there is a total of 40 cases. If I do subset1 <- df[df$A=="A1",] dim(subset1) # 20, i.e., 10 for A1 and 10 for NA's summary(subset1$A) # both A1 and NA have non-zero counts subset2 <- df[df$A %in% c("A1"),] dim(subset2) # 10, as expected summary(subset2$A) # only A1 has non-zero count And it is the same whether the class of the variable used for subsetting is factor or integer. Is it just how equal

问题 We have few datatypes defined for our service response and request objects in a model. Recently we found a need of implementing ToString, HashCode and Equals on all such types to make use of these over comparison and assertions. Confirming from few source like What issues should be considered when overriding equals and hashCode in Java?, Right way to implement equals contract etc we followed implementing toString, equals and hashcode using org.apache.commons.lang3.builder.EqualsBuilder ,