技術標籤：java

package com.my;

import java.util.Objects;

/**
 * 區間
 */
public class Section {
    private final int left;
    private final int right;
    private final boolean leftClosed;
    private final boolean rightClosed;

    /**
     * @param s 區間的字串表示，如：[0~100]，(0~100]，[0~100)，[0,100]
     */
    public static
 
 Section createSectionFromString(final String s){
        //TODO: 解析字串，判斷合法性
        String[] lr=s.split(",");
        final boolean leftClosed=lr[0].startsWith("[");
        final boolean rightClosed=lr[1].endsWith("]");
        final int left=Integer.parseInt(lr[0].substring
 
(1));
        final int right=Integer.parseInt(lr[1].substring(0,lr[1].length()-1));
        return new Section(left,leftClosed,right,rightClosed);
    }

    private Section(final int left, final boolean leftClosed, final int right, final boolean rightClosed) {
        this.left = left;
        this
 
.right = right;
        this.leftClosed=leftClosed;
        this.rightClosed=rightClosed;
    }
    public void checkLegitimacy(final int left,final int right){

    }

    /**
     * 判斷value是否在此區間中
     *
     * @param value
     * @return true=在此區間中，false=不在此區間中
     */
    public boolean inSection(final int value) {
        if(this.leftClosed){
            if(value<this.left){
                return false;
            }
        } else {
            if(value<=this.left){
                return false;
            }
        }
        if(this.rightClosed){
            if(value>this.right){
                return false;
            }
        } else {
            if(value>=this.right){
                return false;
            }
        }
        return true;
    }

    @Override
    public String toString() {
        StringBuilder s=new StringBuilder();
        s.append(this.leftClosed?'[':'(')
                .append(this.left)
                .append(',')
                .append(this.right)
                .append(this.rightClosed?']':')');
        return s.toString();
    }

    @Override
    public boolean equals(Object o) {
        if(this == o) {
            return true;
        }
        if(o == null || getClass() != o.getClass()) {
            return false;
        }
        Section section = (Section) o;
        return left == section.left &&
                right == section.right &&
                leftClosed == section.leftClosed &&
                rightClosed == section.rightClosed;
    }

    @Override
    public int hashCode() {
        return Objects.hash(left, right, leftClosed, rightClosed);
    }
}

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