diff options
Diffstat (limited to 'Year_2/SE')
-rw-r--r-- | Year_2/SE/L21_ex2/Main.java | 11 | ||||
-rw-r--r-- | Year_2/SE/design_patterns/singleton/Logs.java | 10 | ||||
-rw-r--r-- | Year_2/SE/design_patterns/singleton/Main.java | 12 | ||||
-rw-r--r-- | Year_2/SE/error_inheritance/Main.java | 19 | ||||
-rw-r--r-- | Year_2/SE/error_inheritance/Person.java | 10 | ||||
-rw-r--r-- | Year_2/SE/error_inheritance/Student.java | 13 |
6 files changed, 75 insertions, 0 deletions
diff --git a/Year_2/SE/L21_ex2/Main.java b/Year_2/SE/L21_ex2/Main.java new file mode 100644 index 0000000..6f077f9 --- /dev/null +++ b/Year_2/SE/L21_ex2/Main.java @@ -0,0 +1,11 @@ +import java.util.List; + +public class Main { + public static void main(String[] args) { + List<String> l = List.of("to", "speak", "the", "truth", "and", "pay", "your", "debts"); + l.stream() + .map(x -> x.charAt(0)) + .forEach(c -> System.out.print(c)); + } +} + diff --git a/Year_2/SE/design_patterns/singleton/Logs.java b/Year_2/SE/design_patterns/singleton/Logs.java new file mode 100644 index 0000000..85deef9 --- /dev/null +++ b/Year_2/SE/design_patterns/singleton/Logs.java @@ -0,0 +1,10 @@ +public class Logs { + private static Logs log; + + private Logs(){} + + public static Logs getInstanceLogs() { + if(log == null) log = new Logs(); + return log; + } +} diff --git a/Year_2/SE/design_patterns/singleton/Main.java b/Year_2/SE/design_patterns/singleton/Main.java new file mode 100644 index 0000000..5d05cea --- /dev/null +++ b/Year_2/SE/design_patterns/singleton/Main.java @@ -0,0 +1,12 @@ +public class Main { + public static void main(String[] args) { + Logs l = Logs.getInstanceLogs(); + Logs l2 = Logs.getInstanceLogs(); + + // Prints "true" + System.out.println(l == l2); + + // Error, because the constructor is private + // Logs l3 = new Logs(); + } +} diff --git a/Year_2/SE/error_inheritance/Main.java b/Year_2/SE/error_inheritance/Main.java new file mode 100644 index 0000000..206a513 --- /dev/null +++ b/Year_2/SE/error_inheritance/Main.java @@ -0,0 +1,19 @@ +public class Main { + public static void main(String[] args) { + Student s = new Student(); + s.setName("Santo"); + s.setMatr("1948"); + + s.print(); + + Person p = s; + // That's not compile + // p.setMatr("1949"); + p.setName("John"); + p.print(); + + // s.name is equals to p.name, so the code below print + // Hello, John[...] + s.print(); + } +} diff --git a/Year_2/SE/error_inheritance/Person.java b/Year_2/SE/error_inheritance/Person.java new file mode 100644 index 0000000..2e52d79 --- /dev/null +++ b/Year_2/SE/error_inheritance/Person.java @@ -0,0 +1,10 @@ +public class Person { + private String name; + public void setName(String n) { + this.name = n; + } + + public void print() { + System.out.println("Hello, "+ this.name); + } +} diff --git a/Year_2/SE/error_inheritance/Student.java b/Year_2/SE/error_inheritance/Student.java new file mode 100644 index 0000000..1789489 --- /dev/null +++ b/Year_2/SE/error_inheritance/Student.java @@ -0,0 +1,13 @@ +public class Student extends Person { + private String matr; + + public void setMatr(String m) { + this.matr = m; + } + + @Override + public void print() { + super.print(); + System.out.println("I'm "+ this.matr); + } +} |