Jlabel实现内容自动换行简单实例_Java教程

Jlabel实现内容自动换行简单实例

2021-03-16 13:29御风逍遥 Java教程

这篇文章主要介绍了Jlabel实现内容自动换行简单实例，具有一定借鉴价值,需要的朋友可以参考下

在用javaswing写界面时，想实现 jlabel中的文本内容自动换行，网上查了一下，大多是一些比较简单的加个换行而已，于是自己写了一个函数，现在贴出了供大家学习。

效果图如下：

Jlabel实现内容自动换行简单实例

代码如下：

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									package com.zht;

									import java.awt.borderlayout;

									import java.awt.dimension;

									import java.awt.flowlayout;

									import java.awt.fontmetrics;

									import java.util.concurrent.timeunit;

									import javax.swing.jframe;

									import javax.swing.jlabel;

									public class jlabeldemo extends jframe {

									    public static void main(string[] args)

									       throws interruptedexception {

									        system.out.println("hello");

									        jlabeldemo jlabeldemo = new jlabeldemo();

									    }

									    public jlabeldemo() throws interruptedexception {

									        string text = "this space contains technical articles,"

									            + " blogs and discussion forums with questions and answers."

									            + "作为一个java程序员，从论坛上感受到使用java开发程序的人越来多，"

									            + "心中不免欣慰。hello";

									        jlabel label = new jlabel();

									        label.setsize(200, 0);

									        //注意jlabel一定要设置宽度

									        //  system.out.println(label.getwidth());

									        jlabelsettext(label, text);

									        setlayout(new flowlayout());

									        add(label);

									        pack();

									        //  setsize(300, 200);

									        setdefaultcloseoperation(jframe.exit_on_close);

									        setlocationrelativeto(null);

									        setvisible(true);

									    }

									    void jlabelsettext(jlabel jlabel, string longstring) 

									       throws interruptedexception {

									        stringbuilder builder = new stringbuilder("<html>");

									        char[] chars = longstring.tochararray();

									        fontmetrics fontmetrics = jlabel.getfontmetrics(jlabel.getfont());

									        int start = 0;

									        int len = 0;

									        while (start + len < longstring.length()) {

									            while (true) {

									                len++;

									                if (start + len > longstring.length())break;

									                if (fontmetrics.charswidth(chars, start, len) 

									                      > jlabel.getwidth()) {

									                    break;

									                }

									            }

									            builder.append(chars, start, len-1).append("<br/>");

									            start = start + len - 1;

									            len = 0;

									        }

									        builder.append(chars, start, longstring.length()-start);

									        builder.append("</html>");

									        jlabel.settext(builder.tostring());

									    }

									}