Android String Mask maskLeft(String s, int len, char maskChar)

Description

Returns a string consisting of "s", with each of the first "len" characters replaced by "maskChar" character.

License

Apache License

Declaration

public static String maskLeft(String s, int len, char maskChar) 

Method Source Code

//package com.java2s;
/**//from   w  w  w .j  av a2 s  .c o  m
 * Copyright (c) 2000, Google 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.
 */

public class Main {
    /**
     * Returns a string consisting of "s", with each of the first "len" characters
     * replaced by "maskChar" character.
     */
    public static String maskLeft(String s, int len, char maskChar) {
        if (len <= 0) {
            return s;
        }
        len = Math.min(len, s.length());
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < len; i++) {
            sb.append(maskChar);
        }
        sb.append(s.substring(len));
        return sb.toString();
    }

    /**
     * @return a string representation of the given native array.
     */
    public static String toString(float[] iArray) {
        if (iArray == null) {
            return "NULL";
        }

        StringBuilder buffer = new StringBuilder();
        buffer.append("[");
        for (int i = 0; i < iArray.length; i++) {
            buffer.append(iArray[i]);
            if (i != (iArray.length - 1)) {
                buffer.append(", ");
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    /**
     * @return a string representation of the given native array.
     */
    public static String toString(long[] iArray) {
        if (iArray == null) {
            return "NULL";
        }

        StringBuilder buffer = new StringBuilder();
        buffer.append("[");
        for (int i = 0; i < iArray.length; i++) {
            buffer.append(iArray[i]);
            if (i != (iArray.length - 1)) {
                buffer.append(", ");
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    /**
     * @return a string representation of the given native array
     */
    public static String toString(int[] iArray) {
        if (iArray == null) {
            return "NULL";
        }

        StringBuilder buffer = new StringBuilder();
        buffer.append("[");
        for (int i = 0; i < iArray.length; i++) {
            buffer.append(iArray[i]);
            if (i != (iArray.length - 1)) {
                buffer.append(", ");
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    /**
     * @return a string representation of the given array.
     */
    public static String toString(String[] iArray) {
        if (iArray == null) {
            return "NULL";
        }

        StringBuilder buffer = new StringBuilder();
        buffer.append("[");
        for (int i = 0; i < iArray.length; i++) {
            buffer.append("'").append(iArray[i]).append("'");
            if (i != iArray.length - 1) {
                buffer.append(", ");
            }
        }
        buffer.append("]");

        return buffer.toString();
    }

    /**
     * Returns the string, in single quotes, or "NULL". Intended only for
     * logging.
     *
     * @param s the string
     * @return the string, in single quotes, or the string "null" if it's null.
     */
    public static String toString(String s) {
        if (s == null) {
            return "NULL";
        } else {
            return new StringBuilder(s.length() + 2).append("'").append(s)
                    .append("'").toString();
        }
    }

    /**
     * @return a string representation of the given native array
     */
    public static String toString(int[][] iArray) {
        if (iArray == null) {
            return "NULL";
        }

        StringBuilder buffer = new StringBuilder();
        buffer.append("[");
        for (int i = 0; i < iArray.length; i++) {
            buffer.append("[");
            for (int j = 0; j < iArray[i].length; j++) {
                buffer.append(iArray[i][j]);
                if (j != (iArray[i].length - 1)) {
                    buffer.append(", ");
                }
            }
            buffer.append("]");
            if (i != iArray.length - 1) {
                buffer.append(" ");
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    /**
     * @return a string representation of the given native array.
     */
    public static String toString(long[][] iArray) {
        if (iArray == null) {
            return "NULL";
        }

        StringBuilder buffer = new StringBuilder();
        buffer.append("[");
        for (int i = 0; i < iArray.length; i++) {
            buffer.append("[");
            for (int j = 0; j < iArray[i].length; j++) {
                buffer.append(iArray[i][j]);
                if (j != (iArray[i].length - 1)) {
                    buffer.append(", ");
                }
            }
            buffer.append("]");
            if (i != iArray.length - 1) {
                buffer.append(" ");
            }
        }
        buffer.append("]");
        return buffer.toString();
    }

    /**
     * @return a String representation of the given object array.
     * The strings are obtained by calling toString() on the
     * underlying objects.
     */
    public static String toString(Object[] obj) {
        if (obj == null) {
            return "NULL";
        }
        StringBuilder tmp = new StringBuilder();
        tmp.append("[");
        for (int i = 0; i < obj.length; i++) {
            tmp.append(obj[i].toString());
            if (i != obj.length - 1) {
                tmp.append(",");
            }
        }
        tmp.append("]");
        return tmp.toString();
    }
}