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Java example source code file (ChartStackedArea.java)

This example Java source code file (ChartStackedArea.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, builder, chartstackedarea, component_type, data, equalsandhashcode, list, override, string, stringbuilder, stylechart, util

The ChartStackedArea.java Java example source code

 *  * Copyright 2016 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
package org.deeplearning4j.ui.components.chart;

import com.fasterxml.jackson.annotation.JsonInclude;
import lombok.Data;
import lombok.EqualsAndHashCode;
import org.deeplearning4j.ui.components.chart.style.StyleChart;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

 * Stacked area chart (no normalization), with multiple series.
 * Note that in the current implementation, the x values for each series must be the same
 * @author Alex Black
@EqualsAndHashCode(callSuper = true)
public class ChartStackedArea extends Chart {

    public static final String COMPONENT_TYPE = "ChartStackedArea";

    private double[] x = new double[0];
    private List<double[]> y = new ArrayList<>();
    private List<String> labels = new ArrayList<>();

    public ChartStackedArea() {

    public ChartStackedArea(Builder builder) {
        super(COMPONENT_TYPE, builder);
        this.x = builder.x;
        this.y = builder.y;
        this.labels = builder.seriesNames;

    public static class Builder extends Chart.Builder<Builder> {

        private double[] x;
        private List<double[]> y = new ArrayList<>();
        private List<String> seriesNames = new ArrayList<>();

        public Builder(String title, StyleChart style) {
            super(title, style);

         * Set the x-axis values
        public Builder setXValues(double[] x) {
            this.x = x;
            return this;

         * Add a single series.
         * @param seriesName Name of the series
         * @param yValues    length of the yValues array must be same as the x-values array
        public Builder addSeries(String seriesName, double[] yValues) {
            return this;

        public ChartStackedArea build() {
            return new ChartStackedArea(this);

    public String toString(){
        StringBuilder sb = new StringBuilder();
        if(x != null) {
        } else {
        boolean first = true;
        if(y != null) {
            for (double[] d : y) {
                if (!first) sb.append(",");
                first = false;
        if(labels != null) sb.append(labels);
        return sb.toString();

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