Java/Velocity/MathTool

Math tool: round to a given integer

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
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4.45678 rounded to 3 places is $math.roundTo(3, "4.45678")

Reference Class method in Mathtool

import java.io.StringWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collection;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class ProductList {
    public static void main(String[] args) throws Exception {
        Velocity.init();
        Template t = Velocity.getTemplate("./src/calculation.vm");
        VelocityContext ctx = new VelocityContext();
       
        Collection products = new ArrayList();
        products.add(new Product("Product 1", 112.199));
        products.add(new Product("Product 2", 113.991));
        products.add(new Product("Product 3", 111.919));
        ctx.put("productList", products);
        ctx.put("math", new MathTool());
        Writer writer = new StringWriter();
        t.merge(ctx, writer);
        System.out.println(writer);
    }
}

public class Product {
    private String name;
    private double price;
    
    public Product(String aName, double aPrice) {
        name = aName;
        price = aPrice;
    }
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
}
-------------------------------------------------------------------------------------
#set($totalPrice = 0)
#foreach($product in $productList)
  $product.Name    $$product.Price
  #set($totalPrice = $math.add($totalPrice, $product.Price))
#end
Total Price: $$totalPrice

Velocity MathTool: Add

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$math.random is a random number

Velocity MathTool Divide

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$aNumber / 3.2 = $math.div($aNumber, "3.2")

Velocity MathTool: Maximun

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
The maximum of $aNumber and 3.2 is $math.max($aNumber, "3.2")

Velocity MathTool Minimum

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
The minimum of $aNumber and 3.2 is $math.min($aNumber, "3.2")

Velocity MathTool: Multiply

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$aNumber * 3.2 = $math.mul($aNumber, "3.2")

Velocity Math Tool: Power

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$aNumber ^ 3.2 = $math.pow($aNumber, "3.2")

Velocity Math Tool Random

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$math.random is a random number

Velocity MathTool Random Between

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$math.random(1, 20) is a random number between 1 and 20

Velocity Math Tool Round To Integer

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
4.45678 rounded to the nearest integer is $math.roundToInt("4.45678")

Velocity Math Tool: Subtract

import java.io.StringWriter;
import java.io.Writer;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.tools.generic.MathTool;
public class MathToolExample {
  public static void main(String[] args) throws Exception {
    Velocity.init();
    Template t = Velocity.getTemplate("./src/mathTool.vm");
    VelocityContext ctx = new VelocityContext();
    ctx.put("math", new MathTool());
    ctx.put("aNumber", new Double(5.5));
    Writer writer = new StringWriter();
    t.merge(ctx, writer);
    System.out.println(writer);
  }
}
-------------------------------------------------------------------------------------
$aNumber - 3.2 = $math.sub($aNumber, "3.2")