JShell(Java interactive coding tool)

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      JShell(Java interactive coding tool)
        1  Examples
            1.1  Object
                1.1.1  string 
String exampleString = "hello";
exampleString += " world";
"Contains e:"+ exampleString.contains("e") + "   length:" + exampleString.length();
                1.1.2  time 
import java.util.Date;
Date exampleDate = new Date();
"current time:" + exampleDate.toString() + "     value:" + exampleDate.getTime();
                1.1.3  array 
import java.util.Arrays;
double[] exampleArray =  new double[5];
for (int i=0; i
                1.1.4  list 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
List exampleList = new ArrayList<>();
exampleList.addAll(Arrays.asList("a", "b", "c", "d", "e"));
exampleList.toString();
            1.2  Expressions
                1.2.1  Numeric operations
                    1.2.1.1  e 
Math.E
                    1.2.1.2  pi 
Math.PI
                    1.2.1.3  absoluate 
Math.abs(-5.611)
                    1.2.1.4  square root 
Math.sqrt(9)
                    1.2.1.5  cubic root 
Math.cbrt(27)
                    1.2.1.6  power 
Math.pow(2,5)
                    1.2.1.7  power of e 
Math.exp(2)
                    1.2.1.8  natural logarithm(base e) 
Math.log(6)
                    1.2.1.9  common logarithm(base 10) 
Math.log10(6)
                    1.2.1.10  cosine 
Math.cos(0)
                    1.2.1.11  sine 
Math.sin(9)
                    1.2.1.12  tangent 
Math.tan(5)
                    1.2.1.13  arc tangent 
Math.atan(-7.3)
                    1.2.1.14  arc cosine 
Math.acos(0.5)
                    1.2.1.15  arc sine 
Math.asin(0.3)
                    1.2.1.16  round up 
Math.ceil(4.13)
                    1.2.1.17  round down 
Math.floor(4.67)
                    1.2.1.18  round 
Math.round(4.83)
                    1.2.1.19  random 
Math.random()
                    1.2.1.20  maximum 
Math.max(1,-3)
                    1.2.1.21  minimum 
Math.min(1,-3)
                1.2.2  Strings operations
                    1.2.2.1  equals while ignore case 
"Hello".equalsIgnoreCase("hello")
                    1.2.2.2  equals 
"Hello".equals("hello")
                    1.2.2.3  replace first 
"Hello World! World is yourself.".replace("World", "Feeling");
                    1.2.2.4  replace all 
"Hello World! World is yourself.".replace(/World/g, "Feeling");
                    1.2.2.5  starts with 
"Hello".startsWith("h")
                    1.2.2.6  end with 
"Hello".endsWith("o")
                    1.2.2.7  subString 
"Hello".substring(2, 5)
                    1.2.2.8  char at 
"hello".charAt(2)
                    1.2.2.9  concat 
"hello".concat(" world")
                    1.2.2.10  split 
"1,2,3,4".split(",")
                    1.2.2.11  indexOf 
"hello".indexOf("e")
                    1.2.2.12  lastIndexOf 
"hello".lastIndexOf("l")
                    1.2.2.13  length 
"hello".length()
                    1.2.2.14  toLowerCase 
"Hello".toLowerCase()
                    1.2.2.15  toUpperCase 
"Hello".toUpperCase()
                    1.2.2.16  contains 
"Hello".contains("el")
                    1.2.2.17  trim 
" Hello  ".trim()
                    1.2.2.18  isBlank 
"  ".isBlank()
                    1.2.2.19  isEmpty 
"".isEmpty()
                1.2.3  Boolean operations
                    1.2.3.1  list include 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
List exampleListC = new ArrayList<>();
exampleListC.addAll(Arrays.asList("a", "b", "c", "d", "e"));
String exampleStringC = "c";
exampleListC.contains(exampleStringC);
                    1.2.3.2  string match 
// MyBox library paths should have been added in JShell environment
import mara.mybox.tools.StringTools;
String exampleStringM = "abc1233hello";
String exampleRegexM = "\\S*3{2,}\\S*";  
boolean exampleCaseInsensitiveM = true;
StringTools.match(exampleStringM,exampleRegexM,exampleCaseInsensitiveM);
                    1.2.3.3  string include 
// MyBox library paths should have been added in JShell environment
import mara.mybox.tools.StringTools;
String exampleStringI = "abc1233hello";
String exampleRegexI = "3{2}";
boolean exampleCaseInsensitiveI = true;
StringTools.include(exampleStringI,exampleRegexI,exampleCaseInsensitiveI);
                    1.2.3.4  and/or/not 
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
List exampleListB = new ArrayList<>();
exampleListB.addAll(Arrays.asList("a", "b", "c", "d", "e"));
String exampleStringB = "c";
exampleListB.contains(exampleStringB) && 
(exampleListB.size() >= 8 || exampleStringB.length() != 1 || !exampleStringB.startsWith("h"));
            1.3  Methods
                1.3.1  Area of circle 
double circleAreaByDiameter(double diameter) {        
    double radius = diameter / 2;        
    return   Math.PI *  radius * radius ;        
}
circleAreaByDiameter(120) + circleAreaByDiameter(30)
                1.3.2  Round value 
import java.math.BigDecimal;        
import java.math.RoundingMode;        
double scale(double v, int scale) {        
    BigDecimal b = new BigDecimal(v);        
    return b.setScale(scale, RoundingMode.HALF_UP).doubleValue();        
}    
scale(Math.PI, 3)
                1.3.3  Format number 
import java.math.BigDecimal;        
import java.math.RoundingMode;        
double scale(double v, int scale) {        
    BigDecimal b = new BigDecimal(v);        
    return b.setScale(scale, RoundingMode.HALF_UP).doubleValue();        
}        
                                     
import java.text.DecimalFormat;        
String formatDouble(double data, int scale) {        
    try {        
        String format = "#,###";        
        if (scale > 0) {        
            format += "." + "#".repeat(scale);        
        }        
        DecimalFormat df = new DecimalFormat(format);        
        return df.format(scale(data, scale));        
    } catch (Exception e) {        
        return e.toString();        
    }        
}        
                                     
double circleAreaByRadius(double radius) {        
    return   Math.PI *  radius * radius ;        
}        
                                     
formatDouble(circleAreaByRadius(273.4), 4)
                1.3.4  Format date 
import java.util.Date;
import java.util.TimeZone;
import java.text.SimpleDateFormat;

String DatetimeFormat = "yyyy-MM-dd HH:mm:ss.SSS";

String datetimeToString(Date theDate, String format, TimeZone theZone) {
    if (theDate == null || theZone == null) {
            return null;
    }
    SimpleDateFormat formatter = new SimpleDateFormat(format);
    formatter.setTimeZone(theZone);
    String dateString = formatter.format(theDate);
    return dateString;
}

datetimeToString(new Date(), DatetimeFormat, TimeZone.getDefault());
                1.3.5  string match 
import java.util.regex.Matcher;
import java.util.regex.Pattern;

boolean match(String string, String find, boolean isRegex,
            boolean dotAll, boolean multiline, boolean caseInsensitive) {
        if (string == null || find == null || find.isEmpty()) {
            return false;
        }
        try {
            int mode = (isRegex ? 0x00 : Pattern.LITERAL)
                    | (caseInsensitive ? Pattern.CASE_INSENSITIVE : 0x00)
                    | (dotAll ? Pattern.DOTALL : 0x00)
                    | (multiline ? Pattern.MULTILINE : 0x00);
            Pattern pattern = Pattern.compile(find, mode);
            Matcher matcher = pattern.matcher(string);
            return matcher.matches();
        } catch (Exception e) {
            return false;
        }
}

match("Hello1233World", "\\S*3{2,}\\S*", true, true, true, true);
                1.3.6  string include 
import java.util.regex.Matcher;
import java.util.regex.Pattern;

boolean include(String string, String find, boolean caseInsensitive) {
        if (string == null || find == null || find.isEmpty()) {
            return false;
        }
        try {
            int mode = (caseInsensitive ? Pattern.CASE_INSENSITIVE : 0x00) | Pattern.MULTILINE;
            Pattern pattern = Pattern.compile(find, mode);
            Matcher matcher = pattern.matcher(string);
            return matcher.find();
        } catch (Exception e) {
            return false;
        }
    }

include("Hello1233World", "3{2}", true);