first commit for groovy code

Author: vjkumar220

blog1.txt

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+
+
+title 
+groovy basics for Java Programmer
+====
+
+One of the easy ways to install groovy is to use sdkman
+Once installation is complete, make sure path has been set, by typing groovy -v
+
+create a file having extension groovy as follows:
+
+one.groovy
+
+class Two
+{
+static void main(String[] args)
+{
+println 'hello'
+println ("hi");
+
+}
+}
+
+
+we can run the file as follows:
+
+groovy one.groovy
+====
+
+the output is 
+hello
+
+=======
+lessons:
+1. semi-colon is optional. In java semi-colon is must to terminate a statement. 
+2. string literal can be in single quotes as well as in double quotes. In Java String literals can only be enclosed in double quotes.
+3. we did not compile the file instead just ran the source code
+4 parentheses is optional when calling a method
+=======
+
+ 
+class Two
+{
+static void main(String[] args)
+{
+int num
+println num
+}
+}
+
+output is 0
+========
+lessons:
+local variable is initialised with default value. In java it is an error
+=========
+
+class Two
+{
+static void main(String[] args)
+{
+
+int k
+
+if(k)
+println 'yes'
+else
+println 'no'
+
+}
+}
+=========
+lessons:
+output is no. 0 and null are considered as false and non-zero and not null values are considered as true
+=========

enum/One.groovy

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+class One
+{
+static void main(String[] args)
+{
+
+//Status s1=s1.getEmailStatus("sent");
+
+//Status s1=s1.getEmailStatus("Sent");
+
+
+/*
+Status s1=Status.getEmailStatus("sent"); 
+println(s1); //null
+*/
+
+
+Status s1=Status.getEmailStatus("Sent"); 
+println(s1); //null
+
+
+
+}
+}
+

enum/Status.groovy

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+enum Status {
+	
+	
+	SENT("Sent") , FAILED("Failed")  ;
+
+	private String key;
+	
+	private Status(String key) {
+		this.key = key;
+	}
+	
+	public String getKey() {
+		return this.key;
+	}
+	
+	public static Status getEmailStatus(String key) {
+		for (Status keyValues : Status.values()) {
+			if (keyValues.getKey().equals(key)) {
+				return keyValues;
+			}
+		}
+		return null;
+	}
+	
+	public static Status getStatusObject(String key){
+		Status status = null;
+		for(Status keyValue : Status.values()){
+			if(keyValue.getKey().toLowerCase().contains(key)){
+				status = keyValue;
+			}
+		}
+		return status;
+	}
+	
+
+}

exception1.groovy

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+class Exception1
+{
+static main(args)
+{
+
+
+println "Krishna"
+println(5/0)
+println "oops"
+
+}
+
+}
+

exception2.groovy

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+class Exception2
+{
+static main(args)
+{
+Thread.sleep(5000)
+println "Radhey \nRadhey Krishna"
+}
+}
+

exception3.groovy

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+class Exception3
+{
+
+
+
+static main(args)
+{
+
+
+
+
+Thread.sleep(5000)
+
+
+
+println "Hey Gopal Radhey Krishna\n Govind Govind"
+
+
+
+}
+
+
+
+
+}
+

exception4.groovy

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+class Exception4
+{
+static main(args)
+{
+Thread.sleep(5000)
+println "Hey Gopal Radhey Krishna\n Govind Govind"
+}
+}
+

five.groovy

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+class Five
+{
+static main(args)
+{
+
+
+println "Krishna"
+
+
+}
+
+}
+

four.groovy

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+class Four
+{
+static void main(String[] args)
+{
+
+
+String names=['alex','peter','martin']
+
+//println names.each(it) //error
+
+
+//names.each{ println it}
+
+/*
+names=["one","two","three"]
+names.each{ println it}
+*/
+
+String arr=["electron","proton","neutron"]
+
+arr.each{ println it}
+
+}
+
+}
+

groovy-samples

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+Subproject commit b8ff64bbc287fbbaea9f4cce91022a73674dc84a

method/one.groovy

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+class One
+{
+static main(args)
+{
+println getVal()
+}
+
+static def getVal()
+{
+5
+}
+
+}
+

nt.groovy

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+class NT
+{
+static void main(String[] args)
+{
+String str1=null;
+String str=str1;
+if(str)
+println "yes"
+else
+println "no"
+}
+
+}
+

one.groovy

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+class One
+{
+static void main(String[] args)
+{
+
+
+
+int num
+println num
+
+/*
+def num
+println num  // null
+*
+/
+
+//println 'a',500 //error
+
+
+//println a; //error
+
+
+/*
+println 'a'
+println 5
+*/
+
+
+///println hello// error
+
+//println "Shree Krishna"
+
+/*
+if(null)
+println "yes"
+else
+println "no"
+*/
+
+
+}
+
+}
+

three.groovy

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+
+println 'ohhh my god'
+

two.groovy

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+class One
+{
+static void main(String[] args)
+{
+
+int k
+
+if(k)
+println 'yes'
+else
+println 'no'
+
+
+}
+
+}
+