课堂代码测试

标签：num1 num2 int 代码 System 测试 println 课堂 out

// An addition program

 

import javax.swing.JOptionPane;  // import class JOptionPane

 

public class Addition {

   public static void main( String args[] )

   {

      String firstNumber,   // first string entered by user

             secondNumber;  // second string entered by user

      int number1,          // first number to add

          number2,          // second number to add

          sum;              // sum of number1 and number2

 

      // read in first number from user as a string

      firstNumber =

         JOptionPane.showInputDialog( "Enter first integer" );

 

      // read in second number from user as a string

      secondNumber =

         JOptionPane.showInputDialog( "Enter second integer" );

 

      // convert numbers from type String to type int

      number1 = Integer.parseInt( firstNumber );

      number2 = Integer.parseInt( secondNumber );

 

      // add the numbers

      sum = number1 + number2;

 

      // display the results

      JOptionPane.showMessageDialog(

         null, "The sum is " + sum, "Results",

         JOptionPane.PLAIN_MESSAGE );

 

      System.exit( 0 );   // terminate the program

   }

}

运行结果：false
false
true
SMALL
MEDIUM
LARGE

 

 

 

public class Bit {

 

    public static void main(String[] args) {

        int num1 = 8; // 正数

        int num2 = -8; // 负数

        // 按位取反

        int complement1 = ~num1;

        int complement2 = ~num2;

        // 按位与

        int andResult = num1 & num2; 

        // 按位或

 

        int orResult = num1 | num2;

        // 按位异或

 

        int xorResult = num1 ^ num2;

 

 

 

        // 输出结果

 

        System.out.println("按位取反:");

 

        System.out.println(" ~" + num1 + " = " + complement1);

 

        System.out.println(" ~" + num2 + " = " + complement2);

 

        System.out.println();

        System.out.println("按位与:");

 

        System.out.println(num1 + " & " + num2 + " = " + andResult);

 

        System.out.println();

        System.out.println("按位或:");

 

        System.out.println(num1 + " | " + num2 + " = " + orResult);

 

        System.out.println();

 

        System.out.println("按位异或:");

 

        System.out.println(num1 + " ^ " + num2 + " = " + xorResult);

 

    }

 

}

 

public class Test {

 

private static int value=1;

 

public static void main(String[] args) {

 

int value=2;

 

System.out.println(value);

 

}

 

}

 

最后输出2

 

 

int X=100;

 

int Y=200;

 

System.*out*.println("X+Y="+X+Y);

 

System.*out*.println(X+Y+"=X+Y");

 

代码的结果：X+Y=100200

public static class Main{

    public static void main(String[] args) {

        System.out.println("0.51+0.1="+(0.51+0.01));

        System.out.println("1.0-0.42="+(1.0-0.42));

        System.out.println("4.015*100="+(4.015*100));

        System.out.println("123.3/100="+(123.3/100));

    }

}

最终结果为

0.51+0.1=0.52

1.0-0.42=0.5800000000000001

4.015*100=401.49999999999994

123.3/100=1.2329999999999999

标签：num1,num2,int,代码,System,测试,println,课堂,out
From： https://www.cnblogs.com/4a5r/p/17704647.html