Comparing two Strings with equals()

Programming Questions

un_bsd

Comparing two Strings with equals()

in Programming Questions • 2 years ago

I can't seem to get str.equals(str) working correctly.

I have a string that looks like this: 02:12#0#1.0668 where the number between the two # # signs is either 0 or 1. I want to output 'low tide' for 0 and 'high tide' for 1.

Here's what reference has to say about equals():

String str1 = "CCCP";
String str2 = "CCCP";
// Tests to see if str1 is equal to str2
if(str1.equals(str2) == true) {
 println("Equal"); // They are equal so this line will print
} else {
 println("Not equal");
}

I've tried the following bits of code, but in each case, it won't compile unless I comment out the two lines containing the equals() function.

Version 1, attempted failsafe:

public void ShowTides() {
    String[] t1 = splitTokens(Tide1,"#");
    String hl = t1[1]; String ht = "1"; String lt = "0";
    fill(c_text);
    if (hl.equals(ht) == true) {hl = "Low Tide"};
    if (hl.equals(lt) == true) {hl = "High Tide"};
    text(t1[0] +" am ",x,y);
}

Version 2, what I thought would work:

public void ShowTides() {
    String[] t1 = splitTokens(Tide1,"#");                         //    02:12#0#1.0668
    fill(c_text);
    if (t1[1].equals("1") == true) {hl = "Low Tide"};
    if (t1[1].equals("0") == true) {hl = "High Tide"};
    text(t1[0] +" am ",x,y);
}

In version 1 above, I thought if I set a variable to t1[1] and used that instead of t1[1] it would work but apparently its something else. It's got me stumped but it's probably something very simple.

Replies(2)

amnon.owed

Re: Comparing two Strings with equals()

2 years ago

How about this?

String str1 = "02:12#0#1.0668";
String str2 = "02:12#1#1.0668";
String str3 = "02:12#2#1.0668";
void setup() {
println(testTide(str1));
println(testTide(str2));
println(testTide(str3));
exit();
}
String testTide(String string) {
String tide;
String[] tokens = splitTokens(string,"#");
if(tokens[1].equals("0")) { tide = "low tide"; }
else if(tokens[1].equals("1")) { tide = "high tide"; }
else { tide = "other tide"; }
return tide;
}

un_bsd

Re: Comparing two Strings with equals()

2 years ago

thanks anon ... that works ... I still don't see precisely why it works and the other way doesn't. I still have a couple of questions though. The entire script is below, it pulls the four daily tides for humboldt county from fishing.com ... see the url. I recommend changing the url to something more relevant for you location. Anyway, my question relates to line; the function creates 3 strings _time, _tide, and _meters. It could say return; it says return _time; It still seems to set values for _tide, and _meters that I can use in the script. I'm wonder if line 65 is going to cause problems by only explicity returning _time. I tried return _time,_tide,_meters; but it says it can only return one string.

public class Tides {
int x, y;
color c_text;
//PF Font c;
String[] data;
int UpdateInterval;
int LastUpdate;
HtmlList htmlList;
String URL = "http://www.tides4fishing.com/us/california/north-spit-humboldt-bay";
String tempstring;
String Tide1;
String Tide2;
String Tide3;
String Tide4;
String _tide;
String _time;
String _meters;
String _feet;
public Tides (int xtop, int ytop, color color_c, int UpI) {
x = xtop;
y = ytop;
c_text = color_c;
UpdateInterval = UpI * 60 * 1000;
LastUpdate = 0;
htmlList = new HtmlList(URL);
}
public void getTides() {
data = loadStrings(URL);
ParseTempstring("&M1=");
_time = _time + " ";
Tide1 = _time + _tide + _feet + " feet";
ParseTempstring("&M2=");
_time = _time + " ";
Tide2 = _time + _tide + _feet + " feet";
ParseTempstring("&M3=");
_time = _time + " ";
Tide3 = _time + _tide + _feet + " feet";
ParseTempstring("&M4=");
_time = _time + " ";
Tide4 = _time + _tide + _feet + " feet";
LastUpdate = millis();
}
String ParseTempstring (String string) {
for (int i=0; i<data.length; i++){
int t = data[i].indexOf(string);
if(t > -1){
tempstring = data[i].substring(t+4, t+17);
}
}
String[] _ParseOut = splitTokens(tempstring,"#");
_time = _ParseOut[0];
_tide = getTideType(_ParseOut[1]);
_meters = _ParseOut[2];
_feet = nfc(float(_meters) * 3.2808399,2);
return _time;
}
String getTideType (String string) {
if (string.equals("0")) {_tide = "low tide ";}
else if (string.equals("1")) { _tide = "high tide ";}
else {string = "other tide";}
return _tide;
}
public void ShowTides() {
fill(c_text);
text(Tide1,x,y);
text(Tide2,x,y+12);
text(Tide3,x,y+24);
text(Tide4,x,y+36);
if (millis()-LastUpdate >= UpdateInterval) {
myTides.getTides();
println("Updating Tides . . . ");
}
}
}

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