assertFalse(StringUtil.isNumber(null));
        assertTrue(StringUtil.isNumber("0123456789"));
        assertFalse(StringUtil.isNumber("aaaBBBccc"));
        assertFalse(StringUtil.isNumber("０１２３４５６７８９"));
        assertFalse(StringUtil.isNumber(""));
        assertFalse(StringUtil.isNumber("01234abcdef"));
        assertFalse(StringUtil.isNumber("abcdef01234"));
    }

    /**
     *
     */

	// Output:
	// 10
	// 8
	// -1
}

func ExampleLastIndexFunc() {
	fmt.Println(strings.LastIndexFunc("go 123", unicode.IsNumber))
	fmt.Println(strings.LastIndexFunc("123 go", unicode.IsNumber))
	fmt.Println(strings.LastIndexFunc("go", unicode.IsNumber))
	// Output:
	// 5
	// 2
	// -1
}

func ExampleJoin() {
	s := []string{"foo", "bar", "baz"}
	fmt.Println(strings.Join(s, ", "))

  }

  @GwtIncompatible // Predicates.instanceOf
  public void testIsInstanceOf_subclass() {
    Predicate<@Nullable Object> isNumber = Predicates.instanceOf(Number.class);

    assertTrue(isNumber.apply(1));
    assertTrue(isNumber.apply(2.0f));
    assertFalse(isNumber.apply(""));
    assertFalse(isNumber.apply(null));
  }

  @GwtIncompatible // Predicates.instanceOf
  public void testIsInstanceOf_interface() {

  }

  @GwtIncompatible // Predicates.instanceOf
  public void testIsInstanceOf_subclass() {
    Predicate<@Nullable Object> isNumber = Predicates.instanceOf(Number.class);

    assertTrue(isNumber.apply(1));
    assertTrue(isNumber.apply(2.0f));
    assertFalse(isNumber.apply(""));
    assertFalse(isNumber.apply(null));
  }

  @GwtIncompatible // Predicates.instanceOf
  public void testIsInstanceOf_interface() {

//go:wasmimport gojs syscall/js.valueNew
//go:noescape
func valueNew(v ref, args []ref) (ref, bool)

func (v Value) isNumber() bool {
	return v.ref == valueZero.ref ||
		v.ref == valueNaN.ref ||
		(v.ref != valueUndefined.ref && (v.ref>>32)&nanHead != nanHead)
}

func (v Value) float(method string) float64 {
	if !v.isNumber() {
		panic(&ValueError{method, v.Type()})
	}
	if v.ref == valueZero.ref {
		return 0
	}

		}
		if IsLower(r) {
			t.Errorf("IsLower(0x%x - 1<<31) = true, want false", base)
		}
		if IsMark(r) {
			t.Errorf("IsMark(0x%x - 1<<31) = true, want false", base)
		}
		if IsNumber(r) {
			t.Errorf("IsNumber(0x%x - 1<<31) = true, want false", base)
		}
		if IsPrint(r) {
			t.Errorf("IsPrint(0x%x - 1<<31) = true, want false", base)
		}
		if IsPunct(r) {

    }

    /**
     * 文字列が数値のみで構成されているかどうかを返します。
     *
     * @param s
     *            文字列
     * @return 数値のみで構成されている場合、<code>true</code>
     */
    public static boolean isNumber(final String s) {
        if (isEmpty(s)) {
            return false;
        }

        final int size = s.length();
        for (int i = 0; i < size; i++) {
            final char chr = s.charAt(i);

        this.facsimileTelephoneNumber = value;
    }

    public Long getGidNumber() {
        checkSpecifiedProperty("gidNumber");
        return gidNumber;
    }

    public void setGidNumber(Long value) {
        registerModifiedProperty("gidNumber");
        this.gidNumber = value;
    }

    public String getGivenName() {
        checkSpecifiedProperty("givenName");

                                                key="labels.user_uidNumber"/></label>
                                        <div class="col-sm-9">
                                            <la:errors property="attributes.uidNumber"/>

                    false, false, "keyword", 0, 0, null, null, false, null, null, null, null, null, false);
    protected final ColumnInfo _columnGidNumber = cci("gidNumber", "gidNumber", null, null, Long.class, "gidNumber", null, false, false,
            false, "Long", 0, 0, null, null, false, null, null, null, null, null, false);