java代码大全及详解 Java 常用代码汇总

inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: pre-wrap; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>1. 字符串有整型的相互转换
cript" style='BOX-SIZING: border-box; FONT-SIZE: 14px; BORDER-TOP: 0px; FONT-FAMILY: SFMono-Regular, "Liberation Mono", Consolas, Menlo, monospace, "Microsoft Yahei"; BORDER-RIGHT: 0px; BACKGROUND: rgb(43,48,59); WORD-SPACING: 0px; OVERFLOW-X: scroll; BORDER-BOTTOM: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(238,238,238); PADDING-BOTTOM: 20px; FONT-STYLE: normal; PADDING-TOP: 20px; PADDING-LEFT: 20px; BORDER-LEFT: 0px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.45; PADDING-RIGHT: 20px; TEXT-INDENT: 0px; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; border-radius: 3px'>String a = String.valueOf(2); //integer to numeric stringint i = Integer.parseInt(a); //numeric string to an intinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: pre-wrap; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>
inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: normal; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 500; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 32px 0px 16px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.4; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 0px; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial'>2. 向文件末尾添加内容BufferedWriter out = ;try {out = new BufferedWriter(new FileWriter(”filename”, true));out.write(”aString”);} catch (IOException e) {// error processing code} finally {if (out != ) {out.close;}}inkMacSystemFont, "Segoe UI", Roboto, Ubuntu, "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Source Han Sans CN", sans-serif; WHITE-SPACE: pre-wrap; WORD-SPACING: 0px; TEXT-TRANSFORM: none; FONT-WEIGHT: 400; COLOR: rgb(38,38,38); FONT-STYLE: normal; MARGIN: 0px 0px 20px; ORPHANS: 2; WIDOWS: 2; LETTER-SPACING: normal; LINE-HEIGHT: 1.8; BACKGROUND-COLOR: rgb(255,255,255); TEXT-INDENT: 2em; font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial; overflow-wrap: break-word'>