Wu Yuxiong - natural born JAVA development of learning: Method

/ ** returns two values larger integer data variables * / 
public  static  int max ( int num1, int num2) {
    int Result;
    IF (num1> num2) 
      Result = num1;
    the else 
      Result = num2; 
 
   return Result; 
}

public  class TestMax {
    / ** master methods * / 
   public  static  void main (String [] args) {
       int I =. 5 ;
       int J = 2 ;
       int K = max (I, J); 
      System.out.println (I + "and" + j + "comparison, the maximum value is:" + K); 
   } 
 
   / ** return two integers larger the value of variable * / 
   public  static  int max ( int num1, int num2) {
       int Result;
       IF ( num1> num2) 
         Result = num1;
      else
         result = num2;
 
      return result; 
   }
}

public class TestVoidMethod {
  public static void main(String[] args) {
    printGrade(78.5);
  }
 
  public static void printGrade(double score) {
    if (score >= 90.0) {
       System.out.println('A');
    }
    else if (score >= 80.0) {
       System.out.println('B');
    }
    else if (score >= 70.0) {
       System.out.println('C');
    }
    else if (score >= 60.0) {
       System.out.println('D');
    }
    else {
       System.out.println('F');
    }
  }
}

public static void nPrintln(String message, int n) {
  for (int i = 0; i < n; i++) {
    System.out.println(message);
  }
}

public  class TestPassByValue {
   public  static  void main (String [] args) {
     int num1 =. 1 ;
     int num2 = 2 ; 
 
    System.out.println ( "num1 value before the exchange:" + 
                        num1 + ", the value num2: "+ num2); 
 
    // call the method swap 
    swap (num1, num2); 
    System.out.println ( " num1 values after an exchange: "+ 
                       num1 +", the value num2: "+ num2); 
  } 
  / * * the method of switching two variables * / 
  public  static  void the swap ( int N1,int n2) { 
    System.out.println ( "\ T into the swap method" ); 
    System.out.println ( "\ T \ T n1 is a value before the exchange:" + n1
                          + ", the value of n2:" + n2 );
     // exchange values of n1 and n2 
    int TEMP = n1; 
    n1 = n2; 
    n2 = TEMP; 
 
    System.out.println ( "\ t \ t after the exchange value n1" + n1
                          + ", the value of n2: "+ N2); 
  } 
}

// a simple constructor 
class MyClass {
   int X; 
 
  // The following is the constructor 
  MyClass () { 
    X = 10 ; 
  } 
}

// a simple constructor 
class MyClass {
   int X; 
 
  // The following is the constructor 
  MyClass ( int I) { 
    X = I; 
  } 
}

public class ConsDemo {
  public static void main(String args[]) {
    MyClass t1 = new MyClass( 10 );
    MyClass t2 = new MyClass( 20 );
    System.out.println(t1.x + " " + t2.x);
  }
}

public class VarargsDemo {
    public static void main(String args[]) {
        // 调用可变参数的方法
        printMax(34, 3, 3, 2, 56.5);
        printMax(new double[]{1, 2, 3});
    }
 
    public static void printMax( double... numbers) {
        if (numbers.length == 0) {
            System.out.println("No argument passed");
            return;
        }
 
        double result = numbers[0];
 
        for (int i = 1; i <  numbers.length; i++){
            if (numbers[i] >  result) {
                result = numbers[i];
            }
        }
        System.out.println("The max value is " + result);
    }
}

public class FinalizationDemo {  
  public static void main(String[] args) {  
    Cake c1 = new Cake(1);  
    Cake c2 = new Cake(2);  
    Cake c3 = new Cake(3);  
      
    c2 = c3 = null;  
    System.gc(); //调用Java垃圾收集器
  }  
}  
 
class Cake extends Object {  
  private int id;  
  public Cake(int id) {  
    this.id = id;  
    System.out.println("Cake Object " + id + "is created");  
  }  
    
  protected void finalize() throws java.lang.Throwable {  
    super.finalize();  
    System.out.println("Cake Object " + id + "is disposed");  
  }  
}