Java内容重新整理删除过期的东西

2026-02-04 11:04:21 +08:00 · 2025-09-14 03:49:42 -04:00
parent 9b8524ff80
commit 885b795e45
413 changed files with 643 additions and 1340 deletions
--- a/Java/JavaDemo/codedemo/script/PrettyTable.java
+++ b/Java/JavaDemo/codedemo/script/PrettyTable.java
@@ -0,0 +1,125 @@
+package cn.aofeng.demo.script;
+
+import java.io.PrintStream;
+import static java.lang.String.format;
+
+/**
+ * 此代码来自于网络。使用示例：
+ * <pre>
+ * PrettyTable printer = new PrettyTable(out);
+ * printer.print(new String[][] {
+ *      new String[] {"FIRST NAME", "LAST NAME", "DATE OF BIRTH", "NOTES"},
+ *      new String[] {"Joe", "Smith", "November 2, 1972"},
+ *      null,
+ *      new String[] {"John", "Doe", "April 29, 1970", "Big Brother"},
+ *      new String[] {"Jack", null, null, "(yes, no last name)"}
+ * });
+</pre>
+ */
+public final class PrettyTable {
+
+    private static final char BORDER_KNOT = '+';
+    private static final char HORIZONTAL_BORDER = '-';
+    private static final char VERTICAL_BORDER = '|';
+
+    private static final String DEFAULT_AS_NULL = "(NULL)";
+
+    private final PrintStream out;
+    private final String asNull;
+
+    public PrettyTable(PrintStream out) {
+        this(out, DEFAULT_AS_NULL);
+    }
+
+    public PrettyTable(PrintStream out, String asNull) {
+        if ( out == null ) {
+            throw new IllegalArgumentException("No print stream provided");
+        }
+        if ( asNull == null ) {
+            throw new IllegalArgumentException("No NULL-value placeholder provided");
+        }
+        this.out = out;
+        this.asNull = asNull;
+    }
+
+    public void print(String[][] table) {
+        if ( table == null ) {
+            throw new IllegalArgumentException("No tabular data provided");
+        }
+        if ( table.length == 0 ) {
+            return;
+        }
+        final int[] widths = new int[getMaxColumns(table)];
+        adjustColumnWidths(table, widths);
+        printPreparedTable(table, widths, getHorizontalBorder(widths));
+    }
+
+    private void printPreparedTable(String[][] table, int widths[], String horizontalBorder) {
+        final int lineLength = horizontalBorder.length();
+        out.println(horizontalBorder);
+        for ( final String[] row : table ) {
+            if ( row != null ) {
+                out.println(getRow(row, widths, lineLength));
+                out.println(horizontalBorder);
+            }
+        }
+    }
+
+    private String getRow(String[] row, int[] widths, int lineLength) {
+        final StringBuilder builder = new StringBuilder(lineLength).append(VERTICAL_BORDER);
+        final int maxWidths = widths.length;
+        for ( int i = 0; i < maxWidths; i++ ) {
+            builder.append(padRight(getCellValue(safeGet(row, i, null)), widths[i])).append(VERTICAL_BORDER);
+        }
+        return builder.toString();
+    }
+
+    private String getHorizontalBorder(int[] widths) {
+        final StringBuilder builder = new StringBuilder(256);
+        builder.append(BORDER_KNOT);
+        for ( final int w : widths ) {
+            for ( int i = 0; i < w; i++ ) {
+                builder.append(HORIZONTAL_BORDER);
+            }
+            builder.append(BORDER_KNOT);
+        }
+        return builder.toString();
+    }
+
+    private int getMaxColumns(String[][] rows) {
+        int max = 0;
+        for ( final String[] row : rows ) {
+            if ( row != null && row.length > max ) {
+                max = row.length;
+            }
+        }
+        return max;
+    }
+
+    private void adjustColumnWidths(String[][] rows, int[] widths) {
+        for ( final String[] row : rows ) {
+            if ( row != null ) {
+                for ( int c = 0; c < widths.length; c++ ) {
+                    final String cv = getCellValue(safeGet(row, c, asNull));
+                    final int l = cv.length();
+                    if ( widths[c] < l ) {
+                        widths[c] = l;
+                    }
+                }
+            }
+        }
+    }
+
+    private static String padRight(String s, int n) {
+        return format("%1$-" + n + "s", s);
+    }
+
+    private static String safeGet(String[] array, int index, String defaultValue) {
+        return index < array.length ? array[index] : defaultValue;
+    }
+
+    private String getCellValue(Object value) {
+        return value == null ? asNull : value.toString();
+    }
+
+}